+Drag, +Under (3)
This spell costs less to cast, where X is your devotion to black. (Each in the mana costs of permanents you control counts toward your devotion to black.)
Destroy target creature.
Return target creature to its owner's hand.
Draw a card.
Flying
When Thunder Dragon enters the battlefield, it deals 3 damage to each creature without flying.
Gatherer works better in the Companion app!
less to cast, where X is your devotion to black. (Each 
in the mana costs of permanents you control counts toward your devotion to black.)