If your opponent cant cast two spells, they cant turn it from night back into day, keeping your nightbound werewolves flipped until someone can remove one of these cards
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This kind of card would slot well into the latter, so you'd just be looking at another flavor of Affinity decks popping up and wreaking havoc once more
If youre looking for cheaper options, I really like Magus of the Wheel, and I think it achieves the disruption better than Wheel of Misfortune, which is another fine option
You are OK with a four mana spell that leaves a threat or two in play but on a six mana spell that is a much greater problem
As for the front of card sleeves, they are usually distinguished between Standard (also Glossy) and Matte