Modify

Whenever a Zerg attacks and Survives, give it one
+1/+1 or Keyword counter of your choice that
isnt indestructible.
If at least one Zerg creature you control gains a counter this turn, draw a card.
"Design must be simple. Elegant. Implementation, less
so. Sequences must change. Intent static, product fluid. Always can improve. Stressors reveal flaws. Flaws
reveal potential. Always improving. Good." - Abathur