images of rare pokemon cards Pokémon Card GOD Pack! - 10 Ultra OR Full Art (Assorted Lot Top 10 Rarest Pokémon Cards

While there are a few cards like this, Gemstone Caverns is the only land that has this trait, and is one of the ways that players can win on the very first turn of the game under admittedly very specific circumstances

But XY is past, and in this go-around, we have zero capital letters in the "ex", so, do we have to explain the meaning to all, and find it too complex to understand in the eyes of some who weren't here when XY was, or can we interpret this go-around as a different way to Mega evolve, TCG-style, and remake mega turbo under a different name, and leave the past alone as "different", just like NVI's Eelektrik compared to BLK's Eelektrik

So what did make the cut

You should tweak things as demanded by your local meta