Feldon's Library

{t}Put a Research counter on Feldon's Library:
Search your library for a artifact card with
converted mana cost equal to or less than
the number of Research counters on Feldon's
Library. Put that card in your hand and then
shuffle your library.
At the beginning of each players turn, that player
gains control of Feldon's Library.
"Knowledge is for anyone willing to take it" Feldon