yugioh math deck Yu-Gi-Oh! Mathmech Circular - POTE-EN028 - Super Rare Mathmech Induction Mystic Fighters |

Mail from Bill [1st Edition] #105 Pokemon Neo Destiny Keep track of your collection value over time

Then, return up to 1 active Character with a cost of 3 or less to the owner's hand

When paired with a strong sacrifice outlet such as an Ashnods Altar or even when paired with removal spells, Cordial Vampire can be used to increase the potency of its controller's forces

Because they're also machine type monsters, cards such as "Magnetic Mosquito" and "System Down" also hurt them (especially System Down, as it banishes Machines), and are the most common, exploitable, and obvious countermeasures to this deck since "System Down" can eliminate the presence of all Machine monsters on the field as well as those in the Graveyard (which the "Cyber Dragon" archetype are heavily reliant on as most monsters within it allow them to share it's name)