United Charge

All creatures have haste, dethrone and "At the beginning of each player's combat step, you may
untap this creature and have that player gain
control of this creature until end of turn. If you
do, this creature attacks a player other than its
owner this turn if able and can't be sacrificed this
turn." (Whenever a creature with dethrone attacks the
player with the most life or tied for most life, put
a +1/+1 counter on it.)
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