So what cards really ping by Abe-Dar
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Thematically, many of Yusei's cards lean towards being either Warrior or Machine-Type monsters, and even his non-Machine cards tend to have a Machine-like appearance (such as his "Warrior" Synchro Monsters) or are similarly themed, like "Scrap-Iron Scarecrow", "Junk Barrage" or "Iron Resolve"
In regards to Dark Magician, there is a very big concern in regards to the second ability, with spells that either use more than 1 variable, don't use mana for one or more variables (and involve paying a non-mana cost for X), and that re-use the variable (spells costing XX or XXX) are all busted beyond words with it
Then they can summon one monster from the hand with 1000 extra ATK and DEF, making them impervious to card effects