With the format being in generally fast, lands are not really allowed to come in tapped, especially not when facing constant pressure of early threats like Ragavan or DRC
This expansion introduces Pokemon LV.X, which are leveled-up, more powerful Pokemon
Baxcalibur's role in the mainline Pokmon games, particularly in the game 'Pokmon Scarlet and Violet', is that of a high-tier combatant, offering players the chance to explore its potential in battles against formidable opponents
coupled with its lower damage output (160 damage) and heavier KO penalty (like all EX Mega Pokmon, Mega Latios EX being KO-ed instantly costs you the match), this makes it very undesirable to use seriously
To me, it seems quite out of place in red/green, especially with the self-mill plan being green/black
Let's say I play a Brainstorm as an Ancestral Recall using Richard's ability