Sunfrill Imitator as a cheap-ish Dino that can make big attacks as you unleash your larger Dinosaurs is a nice pairing with Belligerent Yearling to get these decks a little lower to the ground
It's the gold standard for buff balance against which many other instants are measured
Clouds Limit Break Cloud's Limit Breaks flexibility makes it very powerful
I think you can make a case for it over the Sudden Spoiling in some Dimir brews and not in others where this was a blowout as a combat trick or with red mass damage effects like Mizzium Mortars that will shoot them all for 4 damage, you'd prefer the Sudden Spoiling to remove things like indestructible
Still, this card is not perfect: Its difficult to build a deck that can make Murktide shine entirely, apart from UR Murk: cheap spells, counterspells and removals are usually a mix only playable in Izzet decks
Grub might give Wort some competition, but this is still a solid value commander