Invasion of Moag

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When Invasion of Moag enters the battlefield, put a +1/+1 counter on each creature you control.
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Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)
At the beginning of your end step, put a +1/+1 counter on target creature you control.