Whenever Bill Ferny, Bree Swindler becomes blocked, choose one —

• Create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

• Target opponent gains control of target Horse you control. If they do, remove Bill Ferny from combat and create three Treasure tokens.

Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost.