This is going to sound completely off the wall, but has anyone ever tried Scab-Clan Berserker? For the past couple months I've been thinking about what my simulator showed (no, I won't be posting a bunch more results) that if you were to tier our cards, Mountain and Eidolon are tier 0, while Lightning Bolt and Goblin Guide are tier 1. Basically... that experiment suggested the best deck was 25ish Eidolons and 35ish lands (that outperformed basically everything).
So I've been thinking about that. It's pretty popular these days to include Pyrostatic Pillar as Eidolon's 5+, but what if that approach isn't optimal? What if instead of going for a strictly worse, next best it's better to go for a worse, but not strictly worse alternative? In Berserker's favor it will almost always renown if you pick your spot, and it's a 1 sided Eidolon that can even trigger on Planeswalkers and other big mana spells. Against it is that it's 3 mana for a 2/2 haste (if it gets to hit as a 3/3 though, you probably win the game).
As for what would be cut to include it, we don't have all that many 3 CMC slots, but what about removing Sulfuric Vortex for it? I could even see cutting one Firecraft.

