Artifact and Land Mythics: Cavern of Souls $34.99 Were ending with a sweet one
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
2021-06-18 If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs
You can also cast Zacama, Primal Calamity on the cheap and still untap all of your lands to have access to even more mana to use to cast Dinosaurs or activate Zacamas abilities
The mana value of a delve spell is the printed mana value in the upper right corner
Entering as a 2/3 with Daybound that can provide target creature with +1/+0 and haste until the end of turn, this creature becomes strictly more powerful when it's night
