In a Two-Headed Giant game, life gained by your teammate won't cause Excalibur II's first ability to trigger, even though it caused your team's life total to increase
Solar Array is a mana rock that will be useful in just about any Artifact Commander deck, but its really well-suited to this one
Throw in the life the opponent is paying for their fetch and shock mana base, and it's fairly realistic that just a Lightning Bolt or two could finish off the opponent after just a single Anathemancer
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Notably, it can be better than Balefire, if an opponent has a board of larger creatures, like a few dozen 7/7's or something, but even then you'd probably rather buff Balefire, or give it double strike
Four preconstructed theme decks have been released as part of the set