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.
Ashiok's minions plumb the depths of the ocean and the psyche.
NM-Mint - $0.30
NM-Mint Non English - $0.30
Lightly Played - $0.30
Lightly Played Non English - $0.30
Moderately Played - $0.30
Moderately Played Non English - $0.30
Heavily Played - $0.30
Heavily Played Non English - $0.30
Damaged - $0.20
Damaged Non English - $0.20