Because its about to get real out there
(2019-05-03) If one of these Gods leaves the graveyard or exile while its last ability is on the stack, it will remain in its new zone, even if that zone is a graveyard or exile
More control black white decks can be made but they are slow, vulnerable and rather boring to play
The spells aren't exiled after casting either, allowing you to play the same powerful spell multiple times a turn

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Cards like Sol Ring (already in every precon), Arcane Signet , and color-appropriate ramp spells are always worth adding