Erika, Potion, and Giant Cape all help to make your Pokemon even tankier than they already are, and that should help you survive most of the Darkrai Ex onslaught
The idea is that each set will have a specific card that will be the card that you want to pull, and a card with chase variants to look for
So if you want to play a Merfolk deck that buffs your army with layers of lords and protects them with tons of cheap interaction and tricks, then Explorers of the Deep is the deck for you
With that in mind, if a scene existed in both games, we had our choice of showing it as the original game did, how the modern version interpreted it, or a unique fusion of both
If you prefer to opt out of the Arena-only formats and stick to Standard and Explorer, which mimic tabletop play, that works too
A spell has been bargained if its controller declared the intention to pay that cost