His ingenious strategy leveraged the first three modes of Demonic Pact to generate a substantial resource advantage before donating the enchantment to his opponent via Harmless Offeringjust in time for its dreaded "you lose the game" ability to trigger
Emergent Ultimatum is still on the stack while you cast the cards you found, so those spells could target it
The same discipline helps you evaluate tournaments, missions, and seasonal events, which can provide real value when entry conditions align with your normal play
The obvious play is for Negan to blow up your best creature
The same logic can apply to cast triggers, and resource generators like Storm-Kiln Artist, Archmage Emeritus and Runaway Steam-Kin will also do massive work during combo turns
It comes with the catch of a potential warp if it's not stored or kept in the ideal environment, too