Earthquake Dragon 
Creature — Elemental Dragon
This spell costs 
less to cast, where X is the total mana value of Dragons you control.
Flying, trample
, Sacrifice a land: Return this card from your graveyard to your hand.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL