Play cards like Arcane Signet, Ixalli's Lorekeeper, and Cultivate to start tossing out larger and larger dinosaurs
Polukranos was a great finisher, but significantly more mana-intensive
Obviously, saying this invites angry fans to crawl out of the walls and prove me wrong with their encyclopedic knowledge - but most people, I suspect, enjoyed the titles mainly for their gameplay, parkour, and awesome settings
Even if you reduce a creatures power the next time you have priority, your opponent has already paid all the costs for the harmonize spell
Going to zero is perfectly reasonable
Breena +1/+1 Counter Politics Breena, the Demagogue wields a tremendous amount of subtle power: she provides card draw for both you and your opponents, while loading up your creatures with +1/+1 counters in the process