TvT - Pig's diamond terran build It is a quick 3 CC build, 1-1-1 opener With three reaper two hellion double prong harass and double viking harass after that Good for early harassment or defense and because of the three CC allows for a nice army later on

TvZ - Beasty's hellion harassment opener into Vibe's old mech TvZ build Depot Rax Gas CC Factory Reactor on Rax Swap Rax and Factory 2x hellion Armory CC 2x hellion Starport Tech lab on rax Second gas 2x hellion Swap rax and starport Build a banshee and research banshee cloak 2x hellion Go and harass with 8 hellions and cloaked banshee at the same time (in diamond, I can usually kill around 20-30 drones with this) Build 4 factories, 1 reactor, 3 techlab Get gasses on all bases Start spamming thor + hellbat exclusively Attack when maxed out

TvP - Beasty's last TvP build Double CC triple widow mine drop at 4:30 Into timing at 7:25 Upgrades for timing: Stim + Combat shield + +1 weapon inf upgrades Units (assuming the drop died): 1 raven, 4 medivacs, 2 tanks + marauders and marines If the push fails without doing damage, start medivac harassment until you get back on your feet If the push doesn't win but does damage, try for a second push with marauder concussive shells and liberator range a bit later

These all have harassment before 4:30 and are able to morph into either all in defense or greedy macro builds, tried and tested, work pretty well at D3-D2

Zerg build is not that good with mech transition, if you are above D2 I'd suggest not transitioning into old mech and instead go for a bio build after the hellion banshee harassment.