Regis, Dystopian Speaker

Mutate {2}{u}{r}{g}
All Elementals in your hand gain Mutate {x},
where X is their mana cost.
When this creature mutates, exile cards from the
top of your library until you exile a nonland card
that costs less than this creature. You may cast it without paying its mana cost. Put the exiled cards
on the bottom of your library in a random order.
Regis' power and toughness are equal to the
number of times it has mutated plus one.