Galaxia, Incarnation of Chaos

Haste, Menace
Galaxia enters the battlefield with 10 Chaos
Counters that grant +1 / +1 and can be spent
like 1 mana of any color. If you cast an instant or sorcery with only that mana, double its power
and deal excess damage to another target.
If Galaxia attacks and is not blocked, add a Chaos Counter.