Fludge, Gunk Guardian

Players can represent Gunk cards using objects from outside the game so long as the game state remains clear and understandable to all players. They might need to get creative. Since Gunk cards are shuffled into players’ libraries, those players should represent Gunk cards using objects that, while face down, are indistinguishable from other cards in their deck.

A Gunk card is a colorless Gunk sorcery named Gunk with cycling {4}. It has no mana cost, so you can’t normally cast it. It has no spell abilities, so if you do find a way to cast it, it won’t have any effect.

Cycling {4} means “{4}, Discard this card: Draw a card.”

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.