As an additional cost to cast this spell, sacrifice a creature. Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile Eldritch Evolution.
![Eldritch Evolution [Mystery Booster]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/a2696f55-20f5-52fb-bd9f-8f56c52dc467.jpg?v=1768425033&width=1445)