Impostor Captain Tennille

Impostor Captain Tennille can't be blocked as long
as you have more cards in hand than each opponent.
Dark Blue Moon — Whenever Impostor Captain Tennille deals combat damage to a player, you
may pay {1}{u}{u}. If you do, tap target artifact or creature that player controls. It doesn't untap
during it's controllers untap step for as long as you control Impostor Captain Tennille.