Given that Overdragon's effect only allows extra attacks on monsters, and since in Duel Links, the opponent can only have 3, Overdragon can only get 4 attacks in, unless the opponent has a monster that can't be destroyed by battle and will need have some way to negate battle damage as a Overdragon with 5 materials will have 4000 atk, or you'd win before 5 hits, the skill wont win often.
You know, it is possible for the skill to come up in competitive play. Amazoness Queen is still pretty common. Throw in an Anti-Magic Arrows to counter the Onslaught and you get through even a defence-position Amazoness.
Not a consistent strategy or great gameplan, but hey, if you don't have a better skill, why not?
Not all skills are good. ;p When was the last time you saw someone use LP Boost Gamma, Moth to the Flame or Card Shuffle? At least it's an interesting gimmick, if a pointless one.
Machine Lord Ur can attack all your opponents monsters. Maybe use in conjunction with cards that summons to your opponents side like bamboo scraps or foolish revival. Maybe set up with the skill Ojama go?
It's designed to be used with Chimeratech Overdragon. Realistically, Half Shut on a Defense Position monster is probably the only way you'd actually trigger the skill without winning by damage or using up a ton of cards, though. Unless the opponent is using Cloudians or Naturia Dragonfly or something. Then you just punish them mercilessly for it.
Fusion summon Chimeratech Overdragon and activate Mystic Box. Also combo with bubonic vermin, troop dragon or peten the dark clown
Cybernetic fusion can use from hand field and graveyard so no 3 is not the max. How you don’t manage to kill someone with 4000 atk points 5x is just asinine. I can see some cheap twin swords bs coming from this