Bug with casting Think Twice
While casting Think Twice I chose two modes (counter spell and draw two discard one). I had three blue mana and five other available. The auto-tapper tapper used all three blue mana for the draw two and did not let me counter because I had no blue available for the other part of the spell. I have to assume this is purely a bug and not just an example of the auto-tapper being silly.
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Rezzahan#77802
commented
Think Twice is a pure "draw one card" spell with flashback with nothing else, it cannot counter spells. You confused it with some other card. The only card I could find, that is modal and has the mentioned two modes is Artistic Refusal.
Regardless, you pay all costs of a modal spell up front, all at once. You do not pay for the modes seperately. If the autotapper paid for the spell, all modes have been paid for. Of course, without knowing the actual card, there might be some other issue.