Finisher spells and other wincons need a bunch of mana to get going, and reliable access to 10+ mana in the mid to late game becomes the goal, with many decks opting to aim higher if they can
Cascading into another legendary nonland card that costs less, costing WUBRG, having chunky stats Hes strong enough to lead his own decks, but hes also a great piece of card advantage to stick in the likes of Sisay, Weatherlight Captain or Esika, God of the Tree
Almost everything on Soldier of the Pantheonthe cost, the size, even the humanity echoes Elite Vanguard
Initially I was going to make a Five-Color Group Hug deck, but then I began to get intrigued by the notion of enchanting Karona with one of the Commander deck Vows, making Karona more deadly (and a better gift to give my opponents) while giving myself protection from her when you have to hand her off to your opponents
The extent to which these were printed is dubious, although I recall hearing the print run was less than one out of every 1,000 packs