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I could see Sultai value decks, not unlike the Teval list above, being built around the duo in the near future

Historic rewards you for playing artifacts (which tend to be overcosted to compensate for their flexible mana costs), Sagas (which tend be good but fluctuate wildly in power level), and legendaries (which tend to be the most powerful creatures in the format, and also planeswalkers)

Curiosity turns his activated ability into one mana for one card, which is an attractive rate

Makes me want to take another shot at that Cadric, Soul Kindler blink deck

Unstable introduced alternate decks with Contraptions, but had a broken incentive structure: cards like Faerie Aerie were so powerful that you were punished for putting other contraptions in your deck (since they decreased your likelihood of getting your best Contraption)