Ain, Henir's Enforcer

Devoid (This creature has no color.)
This creature's power is equal to the number of cards in exile.
At the beginning of your upkeep, Transform this creature unless you pay {p/b}{p/b}{p/b} and exile the top three cards of your library.
{p/b}{p/b}: Exile target nonland permanent.
"The end is drawing near..."