The Worlds Clash

Each player plays with their library flipped
upside down.
If a spell or ability would put something on the
bottom or on top of a library, or if it would put a
card X from the bottom/top, flip that text.
{7}{w}{u}: Target player puts the bottom/top card
of their library on the other side of their library.
This ability costs {1} less for each time it has been
activated.