Besides being able to run Kethis, the Hidden Hand, a number of other Abzan legends use +1/+1 counters to really double-down on Reyhans ability
Also, since you can't be sure of your mana needs, Five Color always runs and loves morphs, since they are a guaranteed three-drop now and find mana to flip later
You can also improve the mana base by allowing players to draft multiple shock lands/fetch lands
Since Skystrike Officer's activated ability doesn't have a tap symbol in its cost, you can tap creatures that haven't been under your control since your most recent turn began (including Skystrike Officer itself if you'd like) to pay the cost
Garruk, Unleashed Playing a planeswalker for 3 or 4 mana is often overpowered
The best payoffs are generally ones that care about big creatures like Garruk's Uprising, Goreclaw, Terror of Qal Sisma, and Fanatic of Rhonas that make use of how big greens creatures often are