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I bet you started reading Primal Vigor, saw "If one or more tokens... twice..." then jumped to the second paragraph and read "If one or more... counters... twice..." I bet you looked at the casting cost and said, "so they made a fixed Doubling Season."

Side Note for Newer Players Since Doubling Season was printed, it has been the gold standard for any card that doubles. It doubles token creatures and any counter that can be put on a permanent. The problem with Doubling Season is that Planeswalkers didn't exist when Doubling Season was created. Planeswalkers present two problems when combined with Doubling Season: Double the starting loyalty. If you double the starting loyalty on most Planeswalkers, reaching that final ability is just far too easy. Look at Elspeth, Sun's Champion (or any Elspeth for that matter). If Doubling Season is out when you play Elspeth, you start with eight loyalty counters. You can use her -7 ability the first turn she is in play! That is not supposed to happen. They don't work the way most people think. Many players believe that when you use Elspeth's +1 ability with Doubling Season on the battlefield, you get 2 loyalty counters. Doubling Season doubles effects, not costs. Adding a loyalty counter to Elspeth to get 1/1 Soldiers is the cost to get the Soldiers. This is not intuitive, since Doubling Season basically reads, "double token creatures and counters."

The doubling cards that have followed since Doubling Season have been variations that "fix" these problems, mostly by limiting the doubling in some way.

I disagree. Primal Vigor is something completely different. But what makes this card different? It doubles tokens. Doubling Season did that. It doubles +1/+1 counters. Doubling Season says that it doubles counters. That's the fixed part. If Primal Vigor only doubles +1/+1 counters, it gets around the whole Planeswalker loyalty issue, and even protects it from insanity around all the various counters that artifacts, lands, and enchantments can produce, or will produce in the future. It may not be as all-encompassing as Doubling Season, but Primal Vigor is a "fixed" Doubling Season.

What's the difference?

The difference lies in the words that you don't see on Primal Vigor: "your control." Doubling Season doubles your token creatures. Doubling Season doubles counters on permanents you control.

Primal Vigor doesn't care who controls the tokens or the creatures.

Primal Vigor is a throwback to the old days of Magic.

Master of the Pearl Trident gives your Merfolk a bonus. Lord of Atlantis is old school, giving all Merfolk a bonus.

Honor of the Pure gives your white creatures +1/+1. Crusade is old school, giving all white creatures +1/+1.

Primal Vigor is old school. Everyone gets the benefit.

I love it.

I get the benefits to the newer style of card. If your cards affect only you, you don't need to worry about your opponent. If I am about the play Honor of the Pure, I don't need to examine every other players' battlefield to determine if I'm giving them a bigger advantage than I'm getting by playing the card. There were plenty of games where I had Crusade but did not play it, since one of my opponents was also running white and had far more creatures than I did on the battlefield. By including the term "that you control," you limit the feel-bad moments in the game when you don't play a card because it was the better play to not the play the card.

That was something I loved about the older cards, and something I love about Commander in particular. With the one-of limitation in Commander decks, you will often find yourself playing those old-school cards that demand you take stock of the table before you play a card. It forces you to demonstrate your skill.

"Should I play this now, later, or not at all?" A card that can benefit your opponents puts a layer of strategy in your game that isn't there otherwise. What do you need to do to ensure that you benefit more than anyone else from this card?

"If I play this, will it encourage my opponents to attack others, since I'm giving them token creatures and +1/+1 counters?" These types of cards offer that group hug option that some players really want. "Look at what I'm doing for you, so don't attack me," can be an effective strategy, but I prefer a group bear hug strategy. Play Hunted Phantasm with Primal Vigor in play, giving my opponent ten 1/1 Goblins. Then follow that up with Massacre Wurm.

Given the open nature of Primal Vigor, when should you include it in your decks? First off, I would not simply treat it as a replacement for Doubling Season. Doubling Season works in decks where you are maximizing your desire to double token creatures and counters. While Primal Vigor can work in those decks, the collateral damage involved in giving random opponents benefits can be a serious drawback. I'm not saying it can't be done. There are times when you are already running Doubling Season in your Commander deck and need another card that does something similar. Primal Vigor may be just what you needed.

Primal Vigor belongs in a deck that takes full advantage of what it offers to you and what it can do to others.

The idea behind this deck is to up your counters while limiting your losses. Cards like Tombstone Stairwell and Alliance of Arms gives your opponents many small creatures that allow you to gain significant life and/or kill off with Massacre Wurm, Elesh Norn, or other options. Cards like Aku Djinn provide benefits to all your opponents' creatures, and Spike Cannibal snatches all that benefit away. Also note the wording on Primal Vigor: "would be placed on a creature." That allows for this scenario.

Play Aku Djinn with Primal Vigor in play. If your three opponents have six creatures in play, each creature would get two +1/+1 counters. Spike Cannibal enters the battlefield with two +1/+1 counters, then his ability moves those twelve counters onto him. Primal Vigor doubles those twelve counters, giving you a 26/26 Spike Cannibal with only six creatures controlled by your opponents! Later in games, particularly with Alliance to Arms or Tombstone Stairwell in play, it is easy for your opponents to have eight or ten creatures each. Three opponents with ten creatures each with two +1/+1 counters adds up to a 122/122 Spike Cannibal.

Llanowar Reborn doesn't play the same, though. It isn't a creature, so it enters the battlefield with only one +1/+1 counter. It does double when you put it on a creature, but it doesn't double again. Don't be so greedy! I just gave you a 122/122 Spike Cannibal!

Some of the cards are just as good with Doubling Season as they would be with Primal Vigor, but it would be crazy not to include them for that reason. We are trying to maximize Primal Vigor, not run a deck that has no use for Doubling Season at all. Cards like Wurmcoil Engine are even more frightening to kill—two 3/3 deathtouch Wurms and two 3/3 lifelink Wurms. As if Wurmcoil Engine wasn't difficult enough to deal with! Hornet Queen brings eight 1/1 flying deathtouch insects with her!

Sigil Captain turns your already-doubled 1/1 token creatures into 5/5 tokens by adding four +1/+1 counters. Primal Vigor may not do anything with Ajani Goldmane's loyalty counters, but Ajani will put two +1/+1 counters on all your creatures with Primal Vigor's help. And if you manage to use the ultimate ability on Ajani, I'm sure you can find something to do with two avatars who use your life total as their power and toughness.

Polukranos, World Eater is there representing most of the creatures with monstrosity in Theros. Spending five mana on its monstrosity gives you four +1/+1 counters. In another deck, Stormbreath Dragon is a 10/10 with monstrous.

Obviously, this is no tuned Commander list. The cards are all over the place. There is no real mana curve, no ramp, and minimal removal of any sort. This is just to give you an idea of the options available with a card like Primal Vigor.

Other cards to consider with Primal Vigor:

There are so many others it is crazy to try and list them.

I'm sure you can come up with many more, and that doesn't even include the other new cards in the Commander (2013 Edition) set!