A serialized card is a variant distinguished by a unique, printed number (e.g., 001/500) that identifies its specific place in a limited print run
BITTER FEUD Artist Proof from Magic: the Gathering
TYPE Legendary Creature Human Soldier Mercenary ABILITY When Cloud enters, search your library for an Equipment card, reveal it, put it into your hand, then shuffle
Played early in the game, not only does this create a strategy of stopping the competition from using a strategically dangerous card, but can quickly fill up the player's inkwell
If you get to the angel side, you get the aristocrat emblem and put opponents on a very real clock
Paying a single green mana to dump your entire deck into your graveyard (assuming you dont run basics) enables a bunch of busted combos