Enter-the-board effect creatures leading up to fat, fat finishers, including Animar himself. This is a minor modification of the stock Mirror Mastery deck. My playgroup has all of the preconstructed decks with similar modifications.

Additions include:

Brutalizer Exarch for a creature tutor or enchant/artifact hoser.

Citanul Flute for a creature tutor.

Cloudstone Curio to make the most of enter/exit effects, and to cancel Sages of the Anima. (Yes, I know there are infinite combos but I don't want to play them.)

Cloudthresher for killing Counterpunch's Storm Herd and anything else that does little fliers.

Draining Whelk as a counterspell.

Forgotten Ancient to pump Animar faster.

Garruk's Packleader for card draw.

Glamerdye to protect Animar from just about everything.

Grinning Ignus to pump up Animar and get colorless mana.

Homura, Human Ascendant to turn all of the otherwise vanilla enter-the-board creatures into fire breathing fliers.

Hystrodon to do card draw in early-mid-game.

It That Betrays for card art and flavor text and to just beat opponents into submission.

Jin-Gitaxias, Core Augur to either win ASAP or mill myself trying.

Lure + Rock Basilisk because it was my signature play 16 years ago when I last played Magic.

Lurking Predators as an insurance policy against people shutting Animar down somehow.

Mimic Vat because of all the enter/exit board creatures.

Mulldrifter for card draw.

Mystic Snake for counterspell (imagine it in a Mimic Vat!)

Primal Command for tutoring and getting my good cards back into my library.

Regrowth because I had a copy from 16 years ago.

Riku of Two Reflections to get copies of all of these creatures.

Sages of the Anima in case I don't get a tutor or if my tutored bomb is shut down.

Shivan Wurm for the trample and bounce effect.

Urabrask the Hidden to draw counterspells/removal out to clear the path for my other finishers.

Vorinclex, Voice of Hunger to let me play anything I want and keep you from doing the same.

Weird Harvest because I expect to be able to play more of those creatures than you can.