Sallana, Touched by Evil

This is a planeswalker and you must control 2 or more creatures to play this.
When this enters the battlefield, put 2 -1/-1 counters on every creature you control.
When this attacks, all of your attacking creatures get +1/+1.
"What could you offer me that would make me destroy a city, Daramesh"
-Sallana Lio