Greens plan was to attack with a big creature, force some damage with trample, and maybe use a combat trick like Giant Growth
Many of these will be free spells whose conditions you can fulfill by discarding other cards from your hand
Drake Haven was the premier cycling payoff card, and its still an excellent choice for a cycling Commander deck
Here, our main plan is Leonin Arbiter, which is solid on its own by taxing fetch lands and other tutor effects (like Expedition Map from Tron, Primeval Titan from TitanShift, or Whir of Invention from Whir Prison) but gets even better in conjunction with Ghost Quarter and Field of Ruin
So long as you keep cards that can remove damage from these characters on standby (like Dinglehopper, Hakuna Matata, or Cinderella, Gentle and Kind) you should be able to keep the gravy train rolling until victory is yours