Llanowar, Mana Keeper

+1: Search for one land card from your library of your choice, reveal it and put it on the battlefield tapped, then shuffle your library
-3: Untap up to three lands you control and one land for each of your opponents
-7: You get a emblem: "Tapped mana dosen't drain your mana pool until your next untap step E.g. tap five mana, cast any numbers of spells with CMC 5"