Dragonlord Silumgar [Dragons of Tarkir Prerelease Promos] Elf Shaman Nightmare's power and toughness are

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

Set: Kaladesh Inventions Type: Legendary Artifact Rarity: Mythic Cost: {5} Whenever you cast a spell

Set: Legends Type: Artifact Rarity: Rare Cost: {6} At the beginning of your upkeep

Set: Commander 2015 Type: Instant Rarity: Rare Cost: {2}{G} Create X 1/2 green Spider creature tokens with reach

add this card's effects to that spell

Dragonlord Silumgar [Dragons of Tarkir Prerelease Promos] Elf Shaman Nightmare's power and toughness areSet: Dragons of Tarkir Prerelease Promos Type: Legendary Creature Elder Dragon Rarity: Mythic Cost: {4}{U}{B} Flying, deathtouch When Dragonlord Silumgar enters the battlefield, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar. Silumgar never passes up an opportunity to add to his opulence.