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If they choose to use three creatures, that's three blockers that are taken care of to allow your other creatures to get in for damage
If your opponent has a bunch of creatures with unearth in the graveyard, you can ruin their reanimation plans by exiling everything, and creating two 2/2 bears isnt terrible in a pinch
Ghirapur Aether Grid and Inspiring Statuary are both solid ways to use our Blood tokens if we dont want to cash them in immediately
However, the splicing cost for Desperate Ritual is same as the casting cost, so this will only be a benefit in only the most corner of cases
Another fairly similar idea is to take the same planeswalker and Spell Queller core and combine it with Urza instead of Mystic Sanctuary: Creatures (15) Planeswalkers (5) Lands (19) Spells (21) Here its very important that the Gilded Goose is Gilded Goose instead of Birds of Paradise or Noble Hierarch because the Food is being used to turn on Mox Opal and decrease the cost of Emry, Lurker of the Loch