Dragonlord Placidusax

Flying, Trample
Dragonlord Placidusax is all colors
Whenever a dragon you control becomes the target
of a spell or ability, it deals damage equal to its
power to target creature.

"The Dragonlord whose seat lies at the heart of the
storm beyond time is said to have been Elden Lord in
the age before the Erdtree. Once his god was fled,
the lord continued to await its return."
—Finger Reader Enya