Verixa, Aether Goddess

+1: You may sacrifice an artifact you control. If you do, Verixa deals 4 damage to target creature, otherwise, create a Treasure token.
0: Until end of turn, Verixa becomes an 6/3 Human Construct with hexproof and indestructible that's still a planeswalker.
-7: For each artifact you control, destroy up to one target nonland permanent.