They are: Beedrill ex (Grass) Charizard ex (Fire) Wugtrio ex (Water) Pikachu ex (Electric) Giratina ex (Psychic) Lucario ex (Fighting) Paldean Clodsire ex (Dark) Tinkaton ex (Steel) Bibarel ex (Normal/Psychic) GamesRadar+
It doesnt come up that often, but it does come up more often than using Arcane Denial on your own spellusing two cards to get three cards is trading a resource (cards) for the same resource (cards), which makes it not that exciting, while trading between resourcesfrom cards to mana, is more likely to get you something you need
Evolve Pokemon with cards that are stated to be able to do so (Froakie to Frogadier, Sobble to Drizzile, Clefairy to Clefable, Charizard V to Charizard VMAX, so forth)
This just isnt the type of generically good card you might throw in any equipment focused deck
Vernal Equinox allows for a lot more stack-fu in games dominated by permanents, giving the players who predominantly play creatures more to do and more decisions to make
The rule seemed to be wildly unpopular and soon after the game began, it was scrapped