Cogwork Tracker
The grudge is printed in the rules text. You reveal this card as you draft it and note who passed it to you, and that note is not flavor: it binds the creature to a specific opponent before a single permanent has entered the battlefield. The two attack clauses encode the consequence. The first is a standing compulsion to attack each combat if able, no direction dictated. The second sharpens it into a vendetta: the creature must, if able, swing at a player you noted for any card named Cogwork Tracker, so even a lone copy already knows whose face it wants. Because that second clause reads "a player you noted for cards named Cogwork Tracker," it pools every note across every copy: pick up a second Tracker from a different neighbor and the creature is now free to point at either of them, not chained to the one who handed it over. More copies widen the field of legal victims rather than assigning each Dog its own author of insult. This is one of a small class of designs that reach past the board and manipulate the draft as a social event, turning the act of passing a creature into a recorded decision with combat consequences a game later. The 4/4 body is generous on rate, and that is the bait: handing it to a neighbor looks like a gift until you remember the gift remembers you. The printed combat is almost an afterthought, the mechanical settling of accounts opened picks earlier, when somebody decided this Dog was your problem and not theirs.
