Swimmer in Nightmares (THB) (#275)

Name: Swimmer in Nightmares
Mana Cost: {2}{U}
Type: Creature — Nightmare Merfolk
Collector Number: 275
Oracle Text: Swimmer in Nightmares gets +3/+0 as long as there are ten or more cards in a single graveyard. Swimmer in Nightmares can't be blocked as long as you control an Ashiok planeswalker.
Rarity: uncommon
Artist: Lucas Graciano