Balerion, the Black Dread

When, Balerion, the Black Dread, enters the battlefield, destroy all creature's opponent's control.

Annihilator 3, Double Strike, Fear, Flanking 5, Flying, Mountainwalk, Soulbond, and Trample

If, Balerion, the Black Dread, is Soulbonded, both creatures become Indestructible and get +2/+2 for each other Dragon on the battlefield under your control