Spore Blight

If a creature blocks or is blocked by a Fungus or Saproling, put a Blight counter on that creature.
If a creature has three or more Blight counters, destroy it and put two 2/2 green Shroomkin fungus creature tokens onto the battlefield under your control.
"The infectious nature of the Sporians isn't something to be trifled with, their Blight consumes anything it touches." - Researcher Field Journal