The goal of this deck is to produce creatures (and even non-creature artifacts) at instant speed. quicksilver amulet allows the user to drop interesting, powerful cards into play on a moment's notice, causing the other player to doubt their plays. In addition, cards like prototype portal and druidic satchel allow the user an outlet into which they might dump unused mana at the end of an oponnent's turn.

as an opponent to this deck, do you want to risk attacking with your most valuable creatures, when your opponent might just drop an engulfing slagwurm into play as a blocker? maybe you should leave a few blockers in play, just in case they throw a blightsteel colossus in at the end of your turn, with an attack only half a turn away!