Sia, Gem-Heart Queen

: If Sia leaves play for any reason, gain 7 Life and shuffle her into your library.
+2: Create a colorless Mastery artifact token, it has "Sacrifice this artifact: Deal 2 damage to up to two targets each, or counter target ability."
-10: Create the game emblem "Whenever lands you control are tapped for mana they produce an additional two mana of any color."