Grolnok, the Omnivore [Innistrad: Crimson Vow]

Description

Set:	Innistrad: Crimson Vow
Type:	Legendary Creature — Frog
Rarity:	Rare
Cost:	{2}{G}{U}

Whenever a Frog you control attacks, mill three cards.

Whenever a permanent card is put into your graveyard from your library, exile it with a croak counter on it.

You may play lands and cast spells from among cards you own in exile with croak counters on them.