Visenya Targaryen

Fire and blood —(When this creature enters the
battlefield, flip a coin. Apply the following abilities
according to the result.)
•Heads: Choose an opponent. That player must
choose between "to bow" or "not to bow". If that
player chooses "to bow", that player discards his
or her hand. If that player chooses "not to bow",
transform Visenya Targaryen, it gains haste and
must attack that player this turn if able.
•Tails: Transform Visenya Targaryen.