Oblitus

Whenever you cast a colorless spell, each opponent
exiles the top card of their library.
Oblitus gets +1/+1 for each card
in opponents exile.
{w}{u}{b}{r}{g} Each opponent exiles the top card
of their library.
At the beginning of the next end step, each
opponent may put cards exiled with Oblitus
into their graveyards, for each card put into
the graveyard this way, you create a
1/1 eldrazi scion token.