Myrkuls ability really shines with niche Slivers, such as Necrotic Sliver, Darkheart Sliver, and Victual Sliver allowing your other Slivers to avoid exile removal
You can buy them individually or as a bundle -- or, if you want to go all out, you can preorder the collector's edition of the bundle
Each creature you control with toughness greater than its power assigns combat damage equal to its toughness rather than its power
What people dont know is how to build their deck in such a way that they can play four copies without it hurting their ability to cast their spells
Other cards worth sea-ing include Bennie Bracks, Zoologist ($19.39 / 15.24), Adrix and Nev, Twincasters ($21.45 / 16.85), and Koma, Cosmos Serpent ($13.82 / 10.86)
The card itself is pretty strong in a go-wide aggro deck, but likely not good enough outside of that