Yes well, if we ignore all the egregous ways you can cheat to not pay the interest (Which I will fix for the next version), it's basically 2 mana since you have to use 1 to pay the interest, and then for the rest of the game you essentially have 1 less mana to work with, so the longer the game the greater the disadvantage.
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u/Kfconsole-eater 8d ago
Probably about as good as black lotus in most decks, exception is underworld breach but 3 mana is still 3 mana