Clash of Critters’ Season 2 Horde Invasion is about rallying your Critters to stop zombie hordes.
The video is titled as a tier list, but the supplied description and draft do not identify any Critters or provide supported tier placements. Use the mode’s stated objective as your starting point: take your Critters into Horde Invasion and fight the zombie hordes.

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26 players commented on this guide.
Good guide for HOT players. The strategy part was useful.
This saved me time in the early game.
This guide answered the exact question I had.
I wish I had read this before upgrading the wrong thing.