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Umbreon has a "Cult of Personality" in the Pokmon world

Top 10 Pokmon Trainers Cards Considered The Best By Players Once you have become familiar with the world of trainer cards and understand how they work, you can learn about the most popular and valuable trainer cards

And thats all before the added layer of the card-grading industry comes into play

It won't enter the battlefield, so it won't be put into a graveyard from the battlefield and its ability won't trigger

In the end, its about what brings you the most joy

The loophole, though, is that you dont need to discard that energy from Mewtwo, so utilising something like the Solrock/Lunatone Energy acceleration engine makes this a safe bet