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5 Tekuthal, Inquiry Dominus The blue Phyrexian pseudo-god from New Phyrexia doubles up all your proliferation activations just by being in play

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When an ability refers to how much a card "costs" or its "base cost," it always refers to the cost displayed on the card

I do think at the very least Kuribandit and possibly reasoning will become staples, but you do have to remember that they only spam themselves when you activate a trap card on the field, and so you need to have a trap that can activate at relatively any safe time (most preferably your opponent's end phase)