1 of 1 pokemon card Pokémon TCG: First Partner Illustration Collection—Series (Each booster pack contains 10 game cards Kadabra - ME01: Mega Evolution

Creatures (13) Planeswalkers (4) Lands (23) Spells (20) A third reason is one Reid touched on years ago: their deck is so redundant that Thoughtseize just costs you mana and life for a trade when a different interactive card would also cost them mana and you no life

Not sure Cosmogoyf has the support it needs in Standard, but maybe

, : You may put a creature card from your hand onto the battlefield

So while some decks might struggle to produce a big payoff from an X spell, green strategies are often well suited to produce lots of mana in a short amount of time, allowing cards like Invasion of Ikoria to suddenly apply pressure with whatever creature is going to be the best solution to a given situation

I know @supersaiyanampharos collects them, and has already been able to find quite a few of them over the years

You won't see this creature type printed on creatures in this set, but keep in mind that creatures with the changeling ability are Goats