Kozilek, the Broken Reality offers cards when cast and a substantial bonus to your colorless army afterward. Its cast trigger has up to two targeted players manifest two cards from their hands, then draws you a card for each card manifested. On the battlefield, your other colorless creatures get +3/+2, improving small utility creatures as well as larger Eldrazi.
Choosing the players creates an interesting tradeoff. An opponent must commit cards from hand as face-down creatures, but receives bodies that may still be useful. Choosing yourself can put some of your cards onto the battlefield while contributing to the draw count. The players choose which cards they manifest, so the trigger does not let you select an opponent's best cards directly.
Manifested cards are colorless 2/2 creatures while face down. Your own manifested creatures can benefit from Kozilek's bonus, becoming much more relevant in combat. Creature cards can potentially be turned face up by paying their mana costs, while noncreature cards need another appropriate effect to change their status.
Nine mana is a major commitment, and reanimation skips the cast-trigger draw. A deck with strong colorless ramp can instead cast Kozilek and use the resulting cards to continue developing. The anthem works best with several creatures already present rather than an otherwise empty board. Small colorless tokens can become serious attackers, letting the card provide a wide-board payoff in addition to its own large body.
