Dragonlord Silumgar is a mythic Legendary Creature — Elder Dragon card from Secret Lair Promo (SLP), collector number 9. Current market price: $19.32 (foil $271.02), TCGplayer market prices via Scryfall.
Flying, deathtouch When Dragonlord Silumgar enters, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar.