Fog Door

When you cast Fog Door, search your library for
a legendary creature and a land, or for two non legendary creatures, each with converted manna
cost X or less, then shuffle your library. Exile
those cards face down. When Fog Door leaves
the battlefield, return those cards to the
battlefield under thier owners control.
Whenever a player attacks you or a planeswalker
you control, sacrafice Fog Door.