They fully abuse the power of 3x E-Hero Airman and not just "Airman gets another Airman", but Airman gets D-Heros. They use Foolish Burial to dump one of Dashguy/Dasher, Diabolicalguy/Malicious, Yomigaeru/Treeborn Frog or Dandylion along with using Monster Gate/Reasoning. (Treeborn Frog/Malicious/Dandylion/Scapegoat for free tributes for Monster Gate) and well, swarm the field after Heavy/Giant Trunade for OTK. It works only cause of 3x E-Hero Airman, without that, the whole deck theme falls apart.
They also have some Diamondguy/Diamond Dude. Since Monster Gate/Reasoning/Heavy/Trunade/Destiny Draw are all Normal Spell cards. (They don't even need to tribute for Monster Gate if effect by Diamondguy) And Destiny Draw have even less chance of being a "dead spell card" in hand cause of 3x E-Hero Airman access.
e.g. Activate ROTA, get E-Hero Airman, Normal summon Airman. Search D-Hero Diabolicalguy. Activate Destiny Draw, discard Diabolicalguy. Remove Diabolicalguy to summon another Diabolicalguy. Tribute Diabolicalguy for Monster Gate. Get another monster, remove another Diabolicalguy in grave for the 3rd Diabolicalguy, etc. You get the swarm theory.
NOTE: We can't really create this deck cause
#1: We don't have E-Hero Airman (This is the core of the deck)
#2: We don't have Dandylion. Really, Dandylion is usually the first card to be dumped with Foolish Burial. Instant 2x tokens for Monster Gate is alot safer then running 3x Diabolicalguy that have a chance of being dead cards in hand. And Dandylion is faster then Treeborn Frog for tribute fodders that's not really intended for tribute summons in the first place. (Treeborn Frog takes 1 turn later after Foolish Burial to special summon itself, Dasher takes some pot luck during draw phase, and thus people usually prefer Dandylion/Diabolicalguy for Foolish Burial over Frog in this D-Hero OTK build)
#3: We don't have Foolish Burial. Another card that really speeds up the OTK swarm part of this deck.