Ramp Seven mana for our Commander isnt a small thing, and even with the discard ability protecting Chromium from pinpoint removal, there are going to be some sweepers that destroy our potential Voltron and increase the Commander Tax
2 Deoxys ex: POP Series 4 (Ultra Rare) $168.26 Striking Speed Forme Art Sceptile and Deoxys set quite a different tone than Mew's adorable scene, with this mythical Pokemon's depiction striking fear into your heart like a bolt of lightning
During the clean-up step of every turn, all "until end of turn" and "this turn" effects (that is any effect with one of the two previous phrases in their rules text) check to see if they go away and are informed by Staying Power that they do not
If tails, remove 5 damage counters from Chansey
Douglas Mccluer [US] (6/2/5), Gholdengo ex/Dudunsparce 223
However, theyre both a tad expensive, so it can be troublesome to set it up