[+1]: Until your next turn, creatures you control get +1/+0 and gain lifelink.
[−2]: Create a 2/2 black Vampire creature token with flying.
[−6]: You get an emblem with "At the beginning of each opponent's upkeep, that player sacrifices a creature."
Only creatures you control as the first ability resolves will get the bonuses. Creatures you come to control after that happens will not.
When the emblem’s ability resolves, if the player controls no creatures, the player won’t sacrifice anything.