If you cast a spell for another cost "rather than pay its mana cost", you can't choose to cast it for any alternative costs
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Niv-Mizzet, Parun: If an effect instructs you to draw multiple cards, Niv-Mizzet's first triggered ability triggers that many times
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Theres a lot you can do with $300,000: buy a couple Teslas, invest in some stocks, get a PS5 or Xbox Series S/X (or a few of them)
I remember when I played PS2 (no, not that one), I didnt much care for the fighting
Furthermore, the strategy relies on a normal monster that has been thoroughly outclassed since the game's beginning, so players did not want to play the Red-Eyes archetype