Opal Palace

{t}: Add {c}.
{1}, {t}: Add one mana of any color in your commander's color identity. If you spend this mana
to cast your commander, it enters with a number
of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.

“Every time I return, I remember less of who I was.
But the Palace always knows.”