Basically, it turns whatever creature you want into a vassal to the crown, with the rider that they cant attack you (the controller of the Aura)
That is to say, Mutants Prey does everything Prey Upon does but much better
Creature - Beast Elemental Wrenn and Realmbreaker Lands you control have ": Add one mana of any color." +1: Up to one target land you control becomes a 3/3 Elemental creature with vigilance, hexproof, and haste until your next turn
Some spells with amass require a different target
Mana Ramp With the card draw in the deck and running a solid 39 lands, Im planning on making a land drop each turn, but Ive got a few extra ways to ramp and fix mana
Its name is functionally impossible to pronounce, it has no casting cost, when its played (by discarding it), it fetches a book from your deck, and it has an ability that sacrifices food to force creatures to hurt themselves