One thing is for sure, Saga is here to stay
This will allow you to move on to the next phase, which is to get Merfolk creatures resolved on the battlefield, and then you can use the natural draw potential that comes with this deck to your advantage and cast enchantments to further strengthen them
When you add in time for rolling and wacky effects, Planechase Commander games can take a while, too, so you should probably expect to settle in for a little longer than normal, though some of the new planes really encourage attacking and moving the game along, so maybe less than you might think if you're used to Planechase Commander already
There are so many +1/+1 counter synergies these days that its incredibly easy to make an oppressively powerful deck with that strategy, and I personally dont like the mental energy required to keep track of all the various triggers those strategies accumulate on the battlefield
Lore-wise it clues you into the mind of Yawgmoth, who's now recognized as a person to the possibly unknowing audience, but also makes the player feel as though theyre some sort of dark mastermind themselves
Regardless of what strategy youre going for, if youre playing green and care about creatures, this card is amazing