Caliban, Betrayer of Death

Haste, Lifelink, Banding, Mutate {4} (If you cast
this spell for its mutate cost, put it over or under
target mutant creature you own. They mutate
into the creature on top plus all abilities from
under it.)
Caliban, Betrayer of Death can't be countered.
When you exceed having gained 21 points of life,
you automatically win the game.
When Caliban, Betrayer of Death enters the batt-
lefield, mutates, or attacks search your library for
a card put it in your hand, then survail 2.