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In truth, any of the Eeveelution SIRs from Prismatic Evolutions could have made this list, because they're all so beautiful, but the honor goes to Umbreon ex (161/131)

While your opponent controls 2 or more face-up monsters, all of the same Type, you can send 1 card from your hand to the Graveyard to select and destroy 1 face-up monster your opponent controls

(Then planeswalk away from this phenomenon.) Great Benevolence Phenomenon When you encounter Great Benevolence

Soul Rope X TRAP When a monster you control is destroyed by a card effect and sent to the Graveyard (except during the Damage Step): Pay 1000 LP

However, the few discover cards have easily earned their spots

I had snapped up these Praetors during the prerelease windows (each at $800 or less), theorizing the unique art would make them quite desirable