Slagwind Assailant

Flying, haste
Slagwind Assailant gains +1/+0 for each poison counter you have. At the beginning of your
upkeep, gain a poison counter.
—Whenever Slagwind Assailant enters or leaves
the battlefield, you gain three poison counters.
Defiled — As long as you have five or more poison counters. Slagwind Assailant gains +2/+0 for each poison counter you have instead.