It that hungers

Devoid (This card has no color)
Double strike, ingest

Return a card from target opponents exile to its owners graveyard: It that hungers gets +2/+2 until end of turn, activate only once each turn and activate only as a sorcery
skittering like a rodent, it snuck into the reservation during the chaos of fur and fangs, eating away matter, its stomach never full, its hunger never waivering