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Since it's an instant, you simply pass your turn, wait until your opponent's upkeep, and then cast it, which is very close to getting an extra turn (the main difference is that your opponent will get to untap)

Effectively, this makes every battle trap or trap that activates on summon miss its timing, making the opponent lose that card

As you get towards to more control style of deck the types of thing you want are more numerous

Im not too keen on treasure being everywhere, but I think this card design is fine

Create a situation where you can aim for X summons on your opponent's turn, and fight while restraining your opponent

and power can be upped when you attack with various technique cards (abilities/tricks) and reinforcements which you can bring in from your hand