Off the top of my head, in Standard and Modern, it prevents some or all of the use of the following cards: Every flashback card (in particular) Ancient Grudge Desperate Ravings Dread Return Dream Twist Faithless Looting Forbidden Alchemy Mystical Teachings Past in Flames Think Twice Unburial Rites Snapcaster Mage Narcomoeba Reanimate Exhume Every undying creature Every persist creature Gravecrawler Ichorid Ashen Ghoul Proclamation of Rebirth Polymorph Probably quite a few others 1) Drogskol Captain Hexproof is a very non-interactive creature mechanic, making it one of the more powerful mechanics to have been printed in recent years
I want to pair this with Sundial of the Infinite or The Master, Multiplied
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This cards three mana cost is pretty steep for a Mana Dork, but theres definitely the potential to get a return on your investment here
As far as the other new Slivers, there are two Im opting for in my build
Official set description An Unknown New Dimension