personally i like revisiting the ling/infestor into ridiculouslyfast3-5ultrapewpew since vipers help that composition so much. i've also done a 1-1 into lair into 3rd into hydra + 2-2 roach/hydra timing.
personally i believe swarm hosts are extremely weak right now if you scout often because 1. they cannot defend multiple fronts and your army is more mobile than his in the first place and 2. because if he is attacking you with hosts he's the one that's scared of losing his entire army
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