Flying, deathtouch
When Dragonlord Silumgar enters the battlefield, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar.
If Dragonlord Silumgar ceases to be under your control before its ability resolves, you won’t gain control of the creature or planeswalker at all.
If Dragonlord Silumgar leaves the battlefield, you no longer control it, and its control-change effect ends.
If another player gains control of Dragonlord Silumgar, its control-change effect ends. Regaining control of Dragonlord Silumgar won’t cause you to regain control of the creature or planeswalker.