Evelyn, the Covetous

Flash
Whenever Evelyn, the Covetous or another
Vampire enters the battlefield under your control,
exile the top card of each player's library with a collection counter on it.

Once each turn, you may play a card from exile
with a collection counter on it if it was exiled by
an ability you controlled, and you may spend
mana as though it were mana of any color to cast it.