Jetting Glasskite

In Commander, Jetting Glasskite occupies a narrow niche — blue decks that want evasive, hard-to-remove threats will occasionally run it, but six mana for a 4/4 is a steep ask when Consecrated Sphinx and Hullbreaker Horror exist at similar price points. The targeting protection does have real political value in multiplayer, since opponents have to invest two spells or abilities to remove it cleanly, but that's a small return on the mana investment. In Legacy and Vintage, it simply doesn't compete — those formats answer six-mana creatures for one mana, and the protection clause does nothing against Swords to Plowshares or Pyroblast. Modern is legal but irrelevant; the card never sees play there.