Typically it is when you know you are facing a burny red deck that you think the Refuges are a good thing to add in, or perhaps you are running a few too many pay life black cards without enough life gain and you are getting scared
Diseased Vermin is another 'swarm of rats' card, and I find this artwork to be quite interesting becuase you don't quite realize the dude is being covered by rats -- pretty grisly amount of detail, too, when you realize the poor fellow's left hand is hanging by sinew and bone
The primer here is that +1/+1 and -1/-1 counter anti-matter each other out of existence, so Celes allows a persist creature like Putrid Goblin or Murderous Redcap to reanimate endless
Honestly, the army of snake tokens usually ends up being the true threat, anyway
This card brings out Sol Ring
Keep an End-Raze Forerunners in your hand ready to go for a repeatable buff and potential win-con, or avoid paying the heft mana-cost for Kozilek while still getting the destruction
