Field Artillery

First Strike
When Field Artillery enters the battle, all Wall creatures not under your control and all creatures with defender not under your control receive 3 -1/-1 counters.When a Wall Creature or creature with defender enters the battlefield not under your control, they receive 3 -1/-1 counters.When a Wall Creature not under your control or a creature with defender not under your control would leave the battlefield as a result of Field Artillery's ability, combat damage from Field Artillery, or an ins