This combo is meant to be played on multiple turns, as Demonic Pact requires the player who controls it to choose one of four different options, one of which reads "You lose the game." What follows is that players need Harmless Offering to cede control of Demonic Pact, but only after the first three options have been used in order to have the opposing player get the Enchantment with no other option but to lose the game at the start of their turn
Prowess and cost reduction together make storming off much easier, and the double strike trigger goes a long way towards finishing off your opponents
As a creature deck its nice to be able to get our army a second lease on life, but we already have a bunch of reanimation effects
Tergrid is built around sacrifice and discard effects, where when your opponents discard or sacrifice any cards, you get to steal them and put them into play under your control
I posted my Delina, Wild Mage decklist in the Luxury Suite channel on the PlayEDH Discord server, asking for feedback and cards that I might have overlooked
Casualties is currently in fewer decks than Deathsprout, a card that will never replace more flexible cards like Assassin's Trophy and Putrefy