Ignoble Hierarch

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
{T}: Add {B}, {R}, or {G}.

He protects the fetid bog from light, life, and the hideous sound of laughter.

The List

Modern Horizons 3 Commander

Secret Lair Drop

Modern Horizons 2 Promos

Modern Horizons 2

A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable). For example, exalted won't trigger if you attack with multiple creatures and all but one of them are removed from combat.