I agree with GUnit, you need the forest often enough to keep your Apes 2/3 and also if you lose the forest then fighting Dragon Stompy is gonna be one tough cookie. U'll definitely lose if they play Blood Moon unless you're lucky and they're unlucky (or keep bad hands).
I played a small tourney today, 12 people attended, I won 5-0-0. Match-ups:Merfolk (2-1), B/W aggro control (2-0), Merfolk (2-0), Landstill (2-1), Dragon Stompy (2-1).The list I played:
4 Kird Ape
4 Grim lavamancer
4 Wild Nacatl
2 Figure of Destiny
4 Tarmogoyf
4 Qasali Pridemage
4 Lightning Bolt
3 Lightning Helix
3 Chain Lightning
3 Path To Exile
1 Swords to Plowshares
2 Sylvan Library
1 Umezawa's Jitte
4 Wooded Foothils
3 Arid Mesa
3 Windswept Heath
3 Taiga
2 Plateau
2 Canopy
1 Savannah
1 Plains
1 Mountain
1 Forest
Sideboard:
3 Krosan Grip
3 Price of Progress
3 Gaddock Teeg
2 Tormod's Crypt
1 Swords to Plowshares
2 Volcanic Fallout
1 Umezawa's Jitte
Mainboard changes:
-3 Chain Lightning; Burn is good but I'm more and more disliking it because it's sorcery speed.
+1 Lightning Helix
+1 Gaddock Teeg
+1 undecided, maybe 2nd Teeg, or something silly like a wasteland. Any suggestions? I prefer either a permanent or a burn spell, preferably something unexpected.
About the sideboard:
Because I expected a lot of aggro and merfolk in particular I decided to run 2 Volcanic Fallout. Didn't expect combo (we always have a aggro meta) so I did not put in the 4th Teeg. I'm not sure about the Tormod's crypt apart from ichorid I don't really see any use for them. I might exchange those for Pithing Needle.

