The Zhalfirin war triangle represents a trinity of might, faith, and guile.

Vintage Masters

Triangle of War

{2}, Sacrifice Triangle of War: Target creature you control fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

{2}, Sacrifice this artifact: Target creature you control fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Visions

o2, Sacrifice Triangle of War: Choose target creature you control and target creature an opponent controls. Each creature deals an amount of damage equal to its power to the other.