Ghost of Jeleva Stromkirk

Flash
Flying
Whenever an opponent casts a commander from
their command zone, create a Treasure token.
Whenever a Treasure token is sacrificed, you may
add one mana of any color. Spend this mana only
to cast your commander from the command zone.
Ghost of Jeleva Stromkirk's toughness is equal to
the number of times it's been cast from the
command zone this game.