Being mono black makes it certainly one of the most playable however being a creature itself just makes it way more useful
Infect cards have seen a ton of play in various formats, mostly due to how Infect interacts with various creature pump effects
Once you are logged in, you can use the search bar to look for both current listings and sold listings: Because Heritage does not have the volume of listings that eBay does, I'm keeping my search very broad and just looking for "Umbreon"
Lattice makes every permanent an artifact, and Karn turns off all activated abilities of artifacts, which means your opponents lands no longer produce mana
Obvious called, and he wants a conversation with you all
There's a host of different things that could be wrong on both sides of a counterfeit card, and some are easier to spot than others