Tantriss, Fleeting Assassin

Shadow
Tantriss, Fleeting Assassin, enters the battlefield
with 4 time counters on it.
Whenever a creature you control dies, create a treasure token and discard
Whenever a creature an opponent controls die,
create two treasure tokens and draw a card
When Tantriss, Fleeting Assassin has no time counters on it, place it in your graveyard