Cards like Elvish Promenade and Imperious Perfect can churn out many Elf creature tokens, too
Only finding cards with flashback or disturb makes it fairly narrow, but I can see a casual deck built around flickering it as a draw engine to find cards like Mirrorhall Mimic and Deep Analysis
If one of your attacking creatures is blocked by multiple creatures, you decide how to divide its combat damage among them
PSA 9s of Rocket's Hitmonchan, Rocket's Sneak Attack and Here Comes Team Rocket
In the mainline games, Xerneas is featured prominently in Pokmon X, where it serves as the game's mascot
And somehow, since the 1996 Base Set (Pokmon TCG Base Set, 1996 launch set) era, it has stayed almost stubbornly consistent, like the world agreed: Yep, this is the shape of nostalgia now. And yeah, maybe its just cardboard