Mutation Flux

Suspend X—{x}{b}{g}{u}. X can't be 0. (Rather
than cast this card from your hand, pay
{x}{b}{g}{u} and exile it with X time counters on it. At
the beginning of your upkeep, remove a time counter.
When the last is removed, cast it without paying its
mana cost.)
Creature spells in your hand have mutate. Their
mutate cost is equal to their mana cost.
Whenever you remove a time counter from
Mutation Flux, you lose 3 life.