A player loses the game after having been dealt 21 damage from one of them, not from both of them combined
You've also got the same comes-into-play triggers for Sai, Reckless Fireweaver, or Aetherflux Reservoir
The premade Commander decks are a great way to get some powerful cards and a very strong skeleton for any Commander deck
Being such a powerful card in the game combines with Belles place as one of Disneys most beloved characters in one of its most-loved films, Beauty and the Beast
7 Treebeard, Gracious Host Treebeard is a Gracious Host indeed, not just for Treefolk decks, but for Halfling and Food decks as well
You could also do this in a Voltron deck, although the second ability is less relevant