mtg card deck builder Magic: The Gathering Ravnica Allegiance Builder's Toolkit | 4 Booster Packs this booster pack lets you relive unforgettable stories with a fresh twist MTG Deck Builder's Toolkit :

While we're here, let's take a look at some of the reprints in the deck

The Cycle of Sin Final Fantasy X is built around the cycle of Sin, a massive creature that rises to cull civilizations that grow too large or too advancedbut whose slaughter can be paused for a period of Calm years when a Summoner sacrifices themselves in a final battle against Sin to summon a final aeon capable of defeating Sin albeit only temporarily, locking the world in a cycle of destruction

You cast an edict and each opponent sacrifices a creature

I havent noticed many lifegain decks running around recently, at least not in Standard, but they do exist in abundance in Pioneer and Explorer, so it might be intended for those formats