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Flying
When Emissary of the Sleepless enters the battlefield, if a creature died this turn, create a 1/1 white Spirit creature token with flying.
Emissary of the Sleepless’s last ability checks only if a creature died earlier in the turn. The creature card doesn’t need to still be in the graveyard.
Emissary of the Sleepless’s last ability doesn’t create additional Spirit tokens if more than one creature died this turn.
Token creatures that are destroyed or put into a graveyard from the battlefield for other reasons do die—they go to their owner’s graveyard before ceasing to exist.
