Final Bow

As an additional cost to cast Final Bow, tap an untapped creature you control.
Final Bow can't be countered.
Destroy target creature or planeswalker. If it's your turn, end the turn. (Exile all spells and abilities on the stack, including this card. Discard
down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects
end.)