"Steamroid" + "Drillroid" + "Submarineroid" A Fusion Summon of this card can only be conducted with the above Fusion Material Monsters. During battle between this attacking card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent.
If you want to try a Roid deck, you should at least be able to get to mid-high plat :) It's not top-tier but it's still pretty decent!
3x Drillroid and 3x Submarine are your central cards. Traps that ends up with defense-position enemy monsters are incredibly good with them, like Etaqua and that Semi-Limited machines-only trap. Then combine with a couple Vision HERO Witches :)
Tribute to the Doomed cant destroy this card! WTF?!
All of its materials are low-level for one. Expressroid and Vehicroid Connection Zone are factors, too. And while the 'roids aren't exactly broken, Steamroid, Drillroid and Submarineroid are all better cards than Ancient Gear Knight, the best low-level Ancient Gear.
I can't believe they give us 3 vehicroid Connection Zone but one Super Vehicroid monster.