Karn, Scion of Urza [Mythic Edition] Asia Pacific Land Program Nightmare's power and toughness are

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

and unholy alliances

Set: Amonkhet Invocations Type: Creature — Angel Rarity: Mythic Cost: {3}{B}{B} Kicker {W}{W} (You may pay an additional {W}{W} as you cast this spell

Lord of Leaves

Karn, Scion of Urza [Mythic Edition] Asia Pacific Land Program Nightmare's power and toughness areSet: Mythic Edition Type: Legendary Planeswalker Karn Rarity: Mythic Cost: {4} +1: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it. 1: Put a card you own with a silver counter on it from exile into your hand. 2: Create a 0 0 colorless Construct artifact creature token with "This creature gets +1 +1 for each artifact you control."