Lucarli, Escort of Oblivion

Companion — Your starting deck contains only
colorless spells and lands. (If this card is your
chosen companion, you may put it into your hand
from outside the game for {3} any time you could cast
a sorcery.)
Whenever you cast a colorless spell exile the top
card of each opponents library. Whenever an
opponent sacrifices a permanent exile that
permanent from their graveyard.