You've locked those cards away in some ersatz elevator, preventing them from getting out
After tweaking it a little, I believe I came up with a card that was not only funny but was actually capable of having a deck built around it (hint: it wants counterspells and cards that use counters)
Gunk Slug is a neat design thats so frustrating to play against (I think its based on custom cards once played at a convention by Richard Garfield, though it mightve been Rosewater)
Even though it isn't strictly a Landfall ability, a card like Gigantoad that cares about the number of lands that you control is also a good option for this type of deck
Alterations (Ink) Alterations (Ink) Inked : The card has been modified with ink (usually a black marker), often to cover up edge wear
This red commander pays for itself in a turn cycle or two, and letting an opponent pick which spell you can't cast leads to interesting political discussions