Leyline Tyrant 
Creature — Dragon
Flying
You don't lose unspent red mana as steps and phases end.
When this creature dies, you may pay any amount of . When you do, it deals that much damage to any target.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL