It does everything: It enables the strategy, its a payoff, and if you can turn it into Sephiroth, One-Winged Angel, which gives you an emblem for the rest of the game
Its also very cool to play a land from exile and still be able to use that second land play with a card like Serra Paragon to replay a valuable land from your graveyard
This auction is for a 100 card, Commander 5 color Enchantment/Shrine Tribal deck
Nowit is very far from being efficient, but it does deal with most things, and you can also cycle it away which also matters for Descend
Blinking Sundering Titan creates two waves of multi-target land destruction
You can discard or cast early burn and pump spells to threaten opponents, trusting in Tersa to finish the game with those spells cast from your graveyard