Helmin, Slithering Silhouette

Deathtouch, menace
Whenever a creature deals combat damage to
you, put a parasite counter on that creature.
Whenever Helmin, Slithering Silhouette attacks,
you may exile target creature with a parasite
counteron it. If you do, Helmin becomes a copy
of that creature until end of turn, except it has
deathtouch and menace.