"Ach! Hans, Run!" is a rare Enchantment card from Unhinged (UNH), collector number 116. Current market price: $3.75 (foil $29.31), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may say "Ach! Hans, run! It's the . . ." and the name of a creature card. If you do, search your library for a card with that name, put it onto the battlefield, then shuffle. That creature gains haste. Exile it at the beginning of the next end step.