Activate only when an "Infernity" monster is selected as an attack target while you have no cards in your hand. Destroy the attacking monster and Special Summon 1 "Infernity" monster from your Graveyard.
Once per turn: You can equip 1 "Inzektor" monster from your hand or Graveyard to this card. If an "Inzektor" card equips to this card: You can look at all Set cards your opponent controls. While this card is equipped to a monster, that monster's Level is increased by 1, also it gains ATK and DEF equal to this card's ATK and DEF.
You can target 1 face-up "Inzektor" monster you control; equip this card from your hand to that target. While this card is equipped to a monster, that monster's original DEF becomes 2600. If this card is sent to the Graveyard while equipped to a monster: You can target 1 "Inzektor" monster in your Graveyard; Special Summon that target. This effect of "Inzektor Giga-Weevil" can only be used once per turn.
It's pretty clear Dark Side of Dimensions was only ever planned to have 6 characters. (Kaiba, Mokuba, Scud, Sera, Yugi and Aigami.) I don't think they'll try and shoehorn anyone else in. (And if they did, it'd probably be Bakura or Atem. Realistically, though, even someone like Tristan, Mani or Duke is much more likely than Weevil, and they also have a 0% chance.)