Gl'bgolyb, of Beyond

Soulbond
Gl'bgolyb can be paired with two other creatures.
As long as Gl'bgolyb is paired with two creatures, those creatures have hexproof and Gl'bgolyb has "{x}{2}{g}{u}, {t}: Destroy each other creature that isn't paired with Gl'bgolyb and has converted mana cost X or less. Activate only at sorcery speed."