pokemon cards obsidian flames booster box Scarlet and Violet black night and sparks flare into an inferno as Charizard ex surges forth with newfound powers of darkness Pokemon Scarlet & Violet Obsidian

The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure

The cards design perfectly captures Kyurems powerful, freezing energy generated from within

Harbinger of the Hunt is a repeatable Enrage enabler that also wipes small threats (or even bigger if we have much mana to dump)

Its especially useful for EDH decks that want blue creatures that tap like Unctus, Grand Metatect, or decks that want a lot of looters like Oskar, Rubbish Reclaimer

Your opponent can't cast non-creature spells that have a converted mana cost equal to the number you chose