While I really like the Sealable Perfect Fits, as they offer an extra bit of protection by covering an edge of the card that the Perfect Fits don't, they're a lot more work to sleeve up, because you have to slide in that extra tab for each sleeve
I swear if I do nothing else with these guides, I *will* price-spike Demon of Dark Schemes
But it could also be played passively and for time, to reduce the opponents library of spells and abilities and to use their own spells against them
If White Mage's Staff granted a Soul Warden-style ability to the creature rather than giving a life on attacking, then it might be playable
Oh, and mass graveyard exile only nets you one creature, but Lion's Sash can do it one at a time and end the game
And lastly, Ashaya, Soul of the Wild makes all your creatures into Forest lands, so Multani could potentially rescue two of your creatures from a removal spell