When Lurking Spinecrawler enters the battlefield, you may choose a nonland card in your hand. If you do, that card perpetually incorporates (Incorporate perpetually adds an additional casting cost to that card, adding any new colors from that cost, and adds abilities/text to that card for the rest of the game.) and gains "When you cast this spell, each opponent sacrifices a creature. Each opponent who can't discards a card." Whenever you cast a multicolored spell, for each of that spell's colors, each opponent loses 1 life and you gain 1 life.