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These creatures can be blocked like normal, but if theyre unblocked, they deal their damage to the planeswalker and remove as many loyalty counters as they have power

The word "you" in a permanent's trigger condition always refers to the permanent's current controller

Of course, it does have the big drawback of letting your opponent draw 2, but situationally this isnt the worst see Prince Johns Mirror below

So as far as strategy goes this card can't do any actual damage but I would consider this card for Time Control alone, I would definitely use this card as soon as possible and add 2 prize cards to your opponent's prize cards, the reason I wouldn't wait late into the game to do this is because it will take awhile to use Time Control once you use it once and your opponent gets to take two prize cards if they defeat it and with a 3 colorless energy card retreat cost you'll want to just keep this card on your bench after you use Time Control once in the beginning of the game

Watch out for the vortex