Ojutai, Soul of Winter | Legendary Creature | Dragon | Flying, vigilance
Whenever a Dragon you control attacks, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's next untap step. | Chase Stone
Atarka, World Render | Legendary Creature | Dragon | Flying, trample
Whenever a Dragon you control attacks, it gains double strike until end of turn. | Karl Kopinski