Vesemir, Witcher Master

Whenever you cast another Legendary Mutant creature spell, you may draw 2 cards.
If you control 4 or more Legendary Mutants, Legendary Mutants you control have +4/+2, Indestructible, and Annihilator 2.
{w}{u}{b}{r}{g}{ut}: Search your library for a Legendary Mutant card, reveal that card, then shuffle your library and put that card on top of it.