The Infinity Gauntlet

{5}, {t}: Put a gem counter on Infinity Gauntlet.
Equipped creature gets +X/+X, where X is the
number of gem counters on Infinity Gauntlet.
As long as Infinity Gauntlet has six gem counters
on it, equipped creature has indestructible, protection from everything, and "When this
creature attacks, destroy up to six permanents."
Equip {x}