Stong, the Chaos Prophet

: Whenever a player casts an instant or sorcery spell or a creature dies, flip a coin. If heads, put three loyalty counters on Stong.
-5: Reveal cards form the top of your library until you reveal an instant or sorcery card. Cast that card without paying its mana cost, then shuffle.
-13: Create a 12/12 blue and black Bird Avatar legendary creature token named Papazotl. It has indestructible, trample, flying and lifelink.