Control the board by repeatedly sacrificing creatures to trigger Plaguecrafter and Mayhem Devil, forcing your opponents into a corner
It can take any player out of the game if you combine it with Peer into the Abyss, or you can enchant it with Phyresis and play something like Echo of Eons or Windfall for a similar effect
Losing flash for a better effect greatly reduces the utility of this card for any reactive blue deck
Ready to play right out of the box, get 1 Black-Red-Green Graveyard Overdrive deck of 100 Ripple Foil cards (including 2 Borderless Profile Legendary cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-frame card of rarity Rare or higher and 1 Traditional Foil alt-frame Common or Uncommon card), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card.
Marcy: By far the best card in the set