Ledger Shredder is a mythic Creature — Bird Advisor card from Special Guests (SPG), collector number 55. Current market price: $18.63 (foil $58.74), TCGplayer market prices via Scryfall.
Flying Whenever a player casts their second spell each turn, this creature connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)