Xiao, Guardian Yaksha

+2: Add one mana of each color among Legendary Creatures you control. Xiao, Guardian Yaksha deals 3 damage to you.
-1: You get an emblem with: "During each upkeep, you and all opponent's creatures take 1 damage." You may play this ability during either turn.
-7: Destroy all creatures and gain 2 life for each, up to 20 life gained. Both players draw 3 cards.