Akoum Refuge [Zendikar] Dryad Knight Nightmare's power and toughness are

Nightmare's power and toughness are each equal to the number of Swamps you control

Set: Dragons of Tarkir Type: Instant Rarity: Uncommon Cost: {1}{W} Destroy target black or red creature that's attacking or blocking

Set: Commander 2017 Type: Artifact Rarity: Rare Cost: {4} Whenever you gain life

Corrosive Gale deals X damage to each creature with flying

After Kroog was destroyed while most of its defenders were at his side

Akoum Refuge [Zendikar] Dryad Knight Nightmare's power and toughness areSet: Zendikar Type: Land Rarity: Uncommon Akoum Refuge enters the battlefield tapped. When Akoum Refuge enters the battlefield, you gain 1 life. {T}: Add {B} or {R}.