Swimmer in Nightmares
Buy at Card Kingdom$0.35

Cheapest priced copy (Theros Beyond Death): $0.35 at Card Kingdom, near mint, their price list as of .

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Swimmer in Nightmares {2}{U}

Creature — Nightmare Merfolk · 1/4 · Uncommon · Theros Beyond Death · #275

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.

Legal inCommanderPioneerModernLegacyVintage

Not legal inBrawlStandardPauper

1 printing · $0.35 at Card Kingdom
SetNumberRarityCard KingdomFoil
Theros Beyond Death275Uncommon$0.35—
2 rulings from Wizards of the Coast
  1. 24 January 2020The first ability of Swimmer in Nightmares gives it just +3/+0, no matter how many graveyards beyond the first have ten cards.
  2. 24 January 2020The ability that modifies the power of Swimmer in Nightmares applies only while it's on the battlefield.