Rahzek, the Summoner

+2: Create a copy of target creature an opponent controls with converted mana cost 3 or less. It gains haste.
+1: Create a 1/1 red snake creature token with "Whenever a land enters the battlefield under your control, you may add one mana of any color."
-5: Create an emblem with "At the beginning of your end step, exile the top card of your library. You may cast it as long as it remains exiled.