When you finish comboing off you'll have as much mana as you need, a bunch of enchantments on the board, and probably not many cards left in your library
This can be obvious from the effect
There were initially discussions of only cards which could plausibly be on Ikoria, and we threw that out the window pretty quickly: it was far too limiting
This includes tears, bends that make cards unplayable, and if a significant portion is destroyed by water damage
Not only will that protect your commander, you'll probably be able to swing without worrying about blockers, you'll be gaining a bunch of life and you won't have to tap Wyleth to attack so you'll have another blocker available to defend with
Greater Good specifications: Pros Near-unlimited card draw possibilities No extra cost to Sacrifice creatures Cons Works best when you Sac large, valuable creatures Greater Good is the Magic card equivalent of 'you get what you pay for'