Elenda is sort of the Serra Ascendant for the zone, and gives you a very real commander damage win con with enough life and a combat trick like Kaya's Onslaught
There's also the tiny problem of this costing seven mana, all of it colored, but the combination of both winning the long game and keeping you alive to see it makes seven feel cheap, and there's enough behind this card that there is no need to worry about following it up with another copy unless your opponent can fire one back at you
You can populate a legendary creature token (assuming you have one), but you probably don't want to
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An Aura put onto the battlefield this way can enchant an artifact, land, or creature that was already put onto the battlefield, but can't enchant an enchantment that's being put onto the battlefield at the same time as it