Small Roid Big City (Common)

Once per turn: You can target 1 other face-up card you control, destroy it, and if you do, add 1 "roid" card from your Deck to your hand. Once per turn, when an attack is declared involving an opponent's monster and a "roid" monster you control: You can send 1 "roid" monster from your Deck to the GY, switch the original ATK and DEF of your battling monster during the damage calculation only.