Damage is the way that most Dragon decks win, so a one-sided damage doubler should be a welcome addition to the archetype
Maybe Boros Reanimator with Plargg, Dean of Chaos could use it well since it can get snagged from Plargg's trigger or just throwing it in a Giant deck as a good value creature
Wildcard slots, foil slots, bonus-sheet cards, showcase treatments, Special Guests, or other set-specific slots can push that number higher, depending on the type of pack being opened
Reaper King is interesting in that, on its surface, it's a Scarecrow lord that grants Scarecrows +1/+1, something we had done many times before
In some instances, resolving this spell could end the game, but being able to draw four cards for a single hit is so strong
The deck also contains two beautiful foil cards from Ursula's Return