Gamora, Blade of Thanos

Haste
When Gamora ETBs, you may put a -1/-1
counter or a +1/+1 counter on target creature.
{t}: Put a -1/-1 counter on target creature.
{t}: Put a +1/+1 counter on target creature.
If you put three or more counters on creatures
this turn, you may search your library for an
artifact card and put it on top. If you do,
transform Gamora.