Unlike most of the other battles, Invasion of Ikoria costs two green mana plus X, where X is as much additional mana you want to sink into the cards casting cost
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You could also copy the colorless cards themselves with cards like Donatello, Gadget Master, Mechanized Production, and Mirrorworks
Sadly doing this to Mana Drain makes it rather unwieldy and obvious
Alternatively, you can win through combat by creating a ton of creature tokens off of Rite of the Dragoncaller, Ovika, Enigma Goliath, and Third Path Iconoclast