Tifa, Martial Artist seems to be one of the strongest commanders from the precons
Aggro decks can utilize him as described above, control decks will lean on the removal aspect but also appreciate the untap ability to gain more mana or grant pseudo vigilance, and combo decks can use the untap ability to do crazy things like untap Gilded Lotus or maybe an even more broken permanent
Player Twos creature attacks Player One, who blocks with their 4/3 creature
Part of the value of Toxic Deluge is that life is less risky to pay in powered formats, an extra turn of speed is more valuable, and the tactical applications of Toxic Deluge are quite important
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The extra part of generating mana of any color gets better if you have changelings, aliens, or doctors