Hangman [Unstable]

As Hangman enters the battlefield, secretly notes a word with six to eight letters.
{1}: Target player who doesn't control Hangman guesses the noted word or an unguessed letter in that word. If they guess wrong, put a +1/+1 counter on Hangman. Any player can activate this ability.
When a player guesses the noted word or all of its letters, sacrifice Hangman.