litten pokemon card shiny Exclusive promo Pokemon single card Litten Holo - McDonald's Collection

Karmic Guide

Next-Gen A Game Changer

Like most Pokmon cards, the value of Xerneas depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Mega Evolution)

The trainer cards Sabrina and Cyrus are also solid options since they allow you to force switches

This can also be used politically, since it can prevent combat damage dealt to any player

Both Lotus Breach in Pioneer and Grinding Breach in Modern are the exact sorts of deck that WotC tends to be fairly proactive about trying to stop, though neither currently has the metagame share necessary to justify a banning right now