Draconic Muralists

When Draconic Muralists dies, you may search your library for a Dragon card, reveal it, put it into your hand, then shuffle.

Balefire Dragon

Flying
Whenever Balefire Dragon deals combat damage to a player, it deals that much damage to each creature that player controls.

Trample
Whenever Thrakkus the Butcher attacks, double the power of each Dragon you control until end of turn.

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Flying
Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon.