The Game Master

Shadowfell (whenever a swamp enters the battlefield under your control)
Choose one-
• return a revenant with equal or lesser mana
cost from the graveyard to the battlefield
or
you may create a 2/2 revenant creature
token with vengeance 1 (vengeance implies that the creature returns to the battlefield at a number of combat steps equal to the number next to Vengeance and the creature will return with a number of +1/+1 counters equal to the number next to vengeance like a modifie