Delphyne, God Queen

+3: Until the beginning of your next upkeep, lands you control gain "whenever you tap this land for any reason, add one mana of any color."
-2: Until the beginning of your next upkeep, dragons you control have "flash and cascade."
-10: Search your library for any number of dragon cards and put them into your hand. You have no maximum hand size for the rest of the game.