This is an attempting to convert the Dirty Kitty extended combo deck into Modern thanks to the reprint of Skirk Prospector. Our game plan is this:
T1 Fetch for a Stomping Ground. Avoid playing Skirk Prospector so it doesn't draw enemy removal.
T2 Play Fecundity if possible (with Ritual+Manamorphose or Simian Spirit Guide). If not, playing Impact Tremors is fine, or even Krenko's Command/Dragon Fodder.
T3 Possible Combo turn A: If Fecundity landed last turn and is still here, dropping Mogg War Marshal, then Skirk Prospector is optimal here. This can start our engine with 3 mana and 3 cards and from there we can hopefully chain up to an Empty the Warrens. If we get an Impact Tremors or Bushwhacker, it's possible to win this turn.
If we didn't get the Fecundity, it's possible to just generate some creatures for tremors, maybe even chain up to an Empty the Warrens for decent damage.
T4 Possible Combo turn B: This is where the combo happened most often for me in testing. We probably have 3 lands, we hopefully already have either Fecundity or Tremors on board. From here we can usually chain up to a big Empty the Warrens and hopefully win from there.
Some card choice notes:
Impact Tremors is for situations where we can't get to our opponent, either they have a big lifelink blocker (Bogles), or an Ensnaring Bridge (Lantern Control), or a Leyline of Sanctity (various). Even if they're playing something odd like Elesh Norn or Night of Souls Betrayal it ensures our tokens get to deal at least one damage on the way out.
2x Forest is in case our opponent is playing Blood Moon or Magus and we can still have access to green without our Manamorphose.
Dragon Fodder/Krenko's Command haven't been in other lists I've seen, but I think with Fecundity online they are great backups to Mogg War Marshal, and they are a decent turn 2 play to give the combo some extra room on the following turns.
Main weaknesses:
Damping Sphere, Rest in Peace/Leyline of the Void, and Chalice. The sideboard hopes to address these, although Chalice on 2 is a serious beating.
