Xantcha, Sleeper Agent Xantcha, Sleeper Agent is one of the most unique commanders in the game, and one of the best for the politically-minded player
It becomes a finisher if you can keep the crown, dishing out incredibly amounts of damage for a mono-blue card
Grimgrin enters the battlefield tapped and can't untap on its own, but at the cost of sacrificing another creature, Grimgrin untaps and gets a +1/+1 counter
A card can be valuable because it is powerful in one of these formats, especially Commander, which has a huge casual player base and constant demand for unique cards
This card reminds me of a card from the recent New Capenna Commander product called Spellbinding Soprano, but it feels like a much more powerful and more repeatable version of that card with the addition of myriad to replace encore and the ability to flash in sorcery spells