Grolnok, the Omnivore 238 (Innistrad: Crimson Vow)

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.

NM - $1.50
LP - $1.50
MP - $1.50
HP - $1.50
DMG - $1.50