When your opponent has a single card that is so powerful it wipes out all your two-for-one card advantage
If youre considering including a two-drop in your aggressive deck, ask yourself if that card is either highly synergistic with what the rest of your aggressive deck is doing or more powerful than Smugglers Copter
Bringing this all back: when should you buy your Dragonscale foils
Because these creatures are also artifacts themselves, it will only add synergy to what the deck is trying to do
Chameleon, Master of Disguise If your deck already plans to stick good creatures, Chameleon, Master of Disguise is a clean and reliable way to double down on that plan
That said, some individual cards that just happen to be knightslike Bloodthirsty Conqueror, Imodane's Recruiter, and Moonshaker Cavalryare among the top-performing knights in competitive play, especially in popular Constructed formats