Harness the Forbidden

Creatures you control get +X/+0 until end of
turn, where X is the greatest power among them.
Until end of turn, whenever a creature you
control would be put in a graveyard from play,
shuffle it into its owner's library instead.
Catalyse - If you spend mana of a single
color to cast this spell, until end of turn draw a
card each time you shuffle a card into your
library.