Vrex, the Bloodstorm

: Each Planeswalker and Creature you control has lifelink If you gained life this turn, place 2 loyalty counters on Vrex, the Bloodstorm
0: Deal one damage to each opponent and each creature opponent controls
-8: Deal 3 damage to each opponent and each creature opponent controls. Then deal x damage to any target, x being the amount of life gained this turn