An easy place to start is adding some of the other additional land drop effects, which were a little too pricey for me to go deep on: Azusa, Lost but Seeking, Kodama of the East Tree, Dryad of the Ilysian Grove, and Exploration are all excellent and will help you make the most of your explore triggers
Green Goblin, Revenant On the surface Green Goblin, Revenant reads as a regular old rummage
It's not like you're going to need to monitor another list that oscillates
To do so, I usually hit the highlights of the design for any one particular mechanic, giving you all a condensed overview of what happened
They involve going even harder on counter synergy
I personally run Spawnsire of UlamogSpawnsire of Ulamog in my Kruphix, God of HorizonsKruphix, God of Horizons deck, but only because I've run it by my group and they've all agreed that it's hilarious to dump a bunch of random Eldrazi onto the battlefield