It does everything: It enables the strategy, its a payoff, and if you can turn it into Sephiroth, One-Winged Angel, which gives you an emblem for the rest of the game
Even though you can keep casting Alien Symbiosis from the graveyard, it costs you a whole card each time, so you lose out no matter what
Well need a few more cards to really get things going, but its a great start
It really shows us what Red and White can do besides just play small aggressive creatures and burn spells
One strong one uses Lurrus of the Dream-Den, Phyrexian Altar, and Kaya's Ghostform to sacrifice and recur Lurrus infinitely for infinite death, ETB, and cast triggers