Temerity, Moonlit Black Rat

Whenever Temerity, Moonlit Black Rat deals
combat damage to a player, that player reveals
their hand. Choose a noncreature, nonland card
from it, then that player discards that card.
Create a Treasure token.
Shadowstep {b}{r} (You may cast this spell
for its shadowstep cost. If you do, it gains haste,
and it's returned from the battlefield to it's owner's
hand at the beginning of the next end step.)