Faeburrow Elder and Selvala, Explorer Returned are the most reliable of Selesnyas mana ramp options due to their low mana cost, but both also need to tap to generate mana, so youll need a way to give them haste to access their mana generation on the turn you play them
Whether this means tapping their creatures, limiting when they can play spells/abilities, mana tax, or sacrificing permanents, all of these count as using a STAX strategy
You should be happy with the stats you can get with it on turn 4 and later in the game, it is not too difficult to create a 4/4 or even 6/6 Zombie
Speaking from the uninformed perspective of someone who's never opened an Unfinity pack, the set looks like it would be fun the first time you tried it, and then never again (outside of an Attraction Commander deck, which admittedly sounds like a laugh)
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