Rein

At the beginning of your upkeep you may
transform.
At the beginning of your first main phase,
secretly write "earthshatter" or "firestrike" on a
piece of paper. Target opponent guesses which
you wrote. If they guessed wrong and you wrote "earthshatter", tap up to three untapped target creatures they control. If they guessed wrong and
you wrote "firestrike", deal 2 damage to that
player twice. Otherwise, tap Reinhardt.