What makes the Shuriken so good is the massive power boost you could feasibly get off of it
Sapphire has good early-game ramp ( Ramp: ways to add extra ink per turn ), but needed something to keep them around until the late-game in order to win
She does enable herself thanks to Lifelink, which is certainly welcome, but Aerith still very much feels like a card from a different deck
For this reason, we need to do everything to prevent our opponent from getting ahead on lore, which means challenging
Not only does it benefit Birds by recurring them, or buffing them, but it also allows you to draw cards when they hit your opponents, so that makes your gameplan very simple: play Birds, deal damage, win
It can also just Commander damage people out of the game, given it grows itself and has Trample