Silver Surfer

In a commander game, Silver Surfer cannot be
cast if an opponent does not have a legendary
creature under their control.
- Changeling, trample, hexproof, indestructible.
You can spend mana as though it were any color.
{t}: {3}
{t}: Tap another target.
{2}: Silver Surfer becomes a copy of another
target creature until end of turn, but is
non-legendary.