Player cheating or a glitch with these cards.
Guy dropped 8 cards with only 2 mana.
1
vote
bsrader#48836
shared this idea
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Rezzahan#77802
commented
Neither, just the power of Firebending X, where X is the creature's power. And that power got increased by a lot before the trigger resolved, and thus the trigger gave a huge amount of mana to cast more spells with.