The Bio-Engineer
Identity — Assassin (M)
Unveil—Sacrifice a nontoken permanent.
When The Bio-Engineer is unveiled, you get {a}{a}{a}{a}{a}{a} (six nut counters).
{1}, Pay {a}: Put a +1/+1 counter on target creature. That creature becomes an artifact in addition to its other types.
{2}, Pay {a}{a}: Gain control of target artifact.