
Creature — Nightmare Merfolk
This creature gets +3/+0 as long as there are ten or more cards in a single graveyard.
This creature can't be blocked as long as you control an Ashiok planeswalker.
1/4
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The ability that modifies the power of Swimmer in Nightmares applies only while it's on the battlefield.
The first ability of Swimmer in Nightmares gives it just +3/+0, no matter how many graveyards beyond the first have ten cards.