Soul Lamp

Whenever a creature dies, its controller may search their library for a creature card with lesser mana value, reveal it, and put it into their hand. If an opponent does this, they lose life equal to that card's mana value and you gain that much life.

{b/g}{g/u}{u/b}, {t}: Until end of turn, target creature you control gains “When this creature dies, return it to the battlefield as a colorless artifact token copy of it, except it’s not a creature.”
Each soul becomes a vessel, hollow and waiti