Gruul Turf, easily findable with one of greens many land search spells
Its never been reprinted (a travesty, if you ask me), so I cant show you the updated Oracle rules text on a card, but I can tell you what it would be if we ever saw Marble Priest again: All Walls able to block Marble Priest do so
Shoot, you can even Reality Shift your own stuff, especially if you know what's on top of your library (via Soothsaying or some such)
They will not notice
This is where the notion of computational complexity comes in
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