Valakut, the Molten Pinnacle's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless, at the time a Mountain enters under your control, you control five or more Mountains other than that new one, and (2) the ability will do nothing if you control fewer than five Mountains other than that new one by the time it resolves
You can make this combo even quicker by special summoning Glow-Up Bloom with One for One , allowing you to grab Glow-Up Bloom straight from the deck
On top of these strategies, you can attack with your weenie creatures (now with deathtouch) and really put some pressure on opponents
I was routed by Mardu Vampires, sideboarded incorrectly against LSV in Game 2 and Game 3 and lost heartbreakingly close Game 3s in the next two rounds
Caesar hits so many favorites for me: hes inexpensive, hes got a decent power and toughness, and with a little sacrifice, he becomes a problem quickly while doing everything that Soldiers wants to do, make more Soldiers and deal damage