Mr. Sinister, Mad Geneticist

{x}{b}: Choose a creature with converted mana
cost {x} from any graveyard and exile it. Create a
copy of that creature under your control, except
it is a Clone in addition to its other types, and
non-legendary if the target creature is legendary.
{u}{g}: Put a +1/+1 counter on target Clone or
Mutant creature you control. Then, move
any number of +1/+1 counters from any Clone
or Mutant creatures you control to target
creature.