You can find infinite deck recipes by searching 'Utopia Deck Master Duel' on Google or Twitter, so if you copy those, the early game should go quite smoothly
Prince John Fraidy-Cat is a fun choice that gives you great stats on the cheap, but could die fast to Amber aggro decks that spam characters
RaiEggs (/) RaiEggs (/) was a deck that was popular for most of the 2007 season, but fell off hard at the end
Attack!: This archetype can easily be its own downfall, as some of the Red Dragons either highly encourage attacking or destroy other monsters that don't attack, meaning that if a field isn't set how a duelist may like, they could end up wiping their own board
Flare Cycle The Flare cycle from Modern Horizons 3 consists of five cards that can be cast for free by sacrificing a nontoken creature of the appropriate color: Each of them are perfectly reasonable cards, especially Flare of Denial given the power of free counters and Flare of Malice since it negates the inherent weakness of a two-for-one by removing multiple cards
This card gives us another way to use our mana on turns our opponents try not to play into our answers, and its also a threat that can take over the game