Contamination is Perseverance's original Epic Spell Card. Previous Versions can be seen here.
When used, it kills all monsters on the board that are under KR, making it extremely similar to Patience's Snow Storm. In fact, aside from its +1 in cost and the obvious requirement of KR rather than Paralyze, it's exactly the same.
It's best used as a follow-up to Pollutant Gas, which will give KR to all enemy monsters that don't have it, resulting in a 10G enemy board wipe. Other options are single target ones like Poison, and Termination to a lesser extend, though quite wasteful.
In terms of monsters, cheap Haste/Charge monsters are the best way to set up the combo, such as Spiders, Temmies and/or Worms.
Spiders (alongside Muffet's Pet) are also obtainable through Spider Web, making Perverance a good adition to a Muffet based PV deck. Worms, meanwhile, are also obtainable through Worming Up, though it's not so much a good 1 turn combo card due to its high price.
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Perishing Souls
- Perishing Souls (by Diamaincrah)