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We have a four-mana kill spell in mono-Green (assuming you do it correctly, of course), then it pumps something, then it resurrects that same huge thing we used to kill the other thing

5 Opposition Agent Nice Land You Got There Originally intended to combat tutor effects, Opposition Agent has made more of a name for itself as an answer to fetch lands

+1 poison counters is potentially a lot, with swarms of Mites it's enough to kill someone in a single turn pretty easily

I browsed the Top Jeskai Commanders and eventually went back to the top of that list: Kykar, Wind's FuryKykar, Wind's Fury

And doubling energy production each time is just a massive value, even if you arent using it to more easily go infinite