Hundun, the Chaotic

Flying
Every decision that a magic play can make other
than casting a spell and playing a land, the player
has to verbally say what they want to happen then
they flip a coin, if they win the flip, what they
wanted to happen, happens, if they lose the flip,
they do the opposite. (This effect makes players flip
the coin for untapping and drawing cards as well. This
also affects all of the spells the players cast that say
may in the spell.)