Quicksilver Fisher

Blue's loot-on-entry creatures go back a long way, and this Phyrexian repaint sits at the larger, more combat-relevant end of that lineage. The template is familiar from the many enters-the-battlefield loot bodies: cash a card you don't want for a fresh one, smoothing your draws while a flier holds the sky. What distinguishes it is that the filtering rides on a 4/3 that closes games rather than a fragile body you'd sacrifice for value. That size is the tradeoff for the loot being a one-shot: no repeatable engine, no activated ability to lean on, just a single card swap the turn it lands. The discard half is quietly the useful part, because a card you loot away isn't gone in the way a drawn-and-buried card is; it can feed a graveyard you'd rather fill than empty. Five mana buys an honest flier without an oppressive one, a self-selecting attacker that rewards decks holding cards worth binning and gives nothing extra to decks that just want a beater.