Alex, Master of Dungeons

You control all other players' turns, but they tell
you what they'd like to do. You may choose to
listen.
Roll a d20: On any result, perform an action of
your choice and pretend that the dice sanction it
without showing other players the die.
{t}, Create a creature card. You choose its rule text,
power, and toughness, as well as any other attributes.