pokemon cards m rayquaza ex 2015 Roaring Skies 61/108 CGC 7.5 [3] Emerald Break (30x) This attack does 30 damage times the number of your Benched Pokemon. Mega Rayquaza EX 76/108 Classic

And it made it difficult for them to recover

There's certainly potential there though

The reminder text states that one or more modes must be chosen

This makes playing many copies of your finisher super reasonable, as there are a ton of excellent artifacts and enchantments in the format to hit making this an extremely well-rounded answer and threat

If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure

That gives it a total of 15 cards it can go after which is amazing and can stabilize your strategy in whichever way you need it to