Cliff's Edge Civilization

Enchant basic Mountain
Enchanted land has "{t}: Exile the top card of
your library. You may cast that card this turn,"
and "{r},{t}: Create a token copy of Cliff's Edge Civilization and attach it to a basic Mountain you control."
At the end of combat, if you were not attacked by
a red creature this turn, choose a creature
without flying that attacked you this turn and flip
a coin; that creature's controller sacrifices it if
you win the flip.