Using contagion to cast slimy doom has always struck me as Slimy Doom being unbalanced, not Contagion itself.
If you're in the fourth round of combat with something that doesn't have legendary saves that you targeted in round 1, you're probably doing it wrong, so I'm not sure how relevant turn 4 slimy doom really is any more. Starting the fight with Slimy Doom that couldn't be ended until round 4 was always what was scary.
Using contagion to cast slimy doom has always struck me as Slimy Doom being unbalanced, not Contagion itself.
If you're in the fourth round of combat with something that doesn't have legendary saves that you targeted in round 1, you're probably doing it wrong, so I'm not sure how relevant turn 4 slimy doom really is any more. Starting the fight with Slimy Doom that couldn't be ended until round 4 was always what was scary.
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I'm going to make this way harder than it needs to be.