Poliwrath (Genetic Apex) is not available in Rare Packs
The other Spells (Monster Reborn, Desires, and Called by) are more or less self-explanatory, with the exception of the rarely played Scapegoat
If your opponents don't act, it's only a matter of time until they get Gnomed by your massive army of tokens that just keeps getting bigger and harder to deal with
C Common Rare Value X SPELL If you control 2 or more "Crystal Beast" cards in your Spell & Trap Zone: Your opponent chooses 1 "Crystal Beast" card in your Spell & Trap Zone, you send it to the GY, and if you do, you draw 2 cards
The card is arguably an even better fit for Azlask, The Swelling Scourge, since that deck cares about Eldrazi spawn, and Kozilek's Command makes a ton of them