Whenever Diseased Vermin deals combat damage to a player, put an infection counter on it.
At the beginning of your upkeep, Diseased Vermin deals X damage to target opponent previously dealt damage by it, where X is the number of infection counters on it.
During your upkeep, Diseased Vermin deals 1 damage to a single target opponent it has previously damaged for each infection counter on Diseased Vermin.
If Diseased Vermin damages a player in combat, put an infection counter on it.
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