[Snake]

Cruel Enchant could work in a way that it refunds momentum per ally you deal kickback damage to with it, for a maximum of 4M. (So it refunds 1M, and lets you cast 1 more enchant.)

The rest is just a big whatever. Petrified could be a good status effect to implement for Shell.

[Skullcatrons]

Some other suggestions that I forgot to post here:

Tyrant's Throne - If the Ruler is Main Class. Everytime they end their turn seated, all automatons gain one energy.

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Bishop Pawn's Skill - Preach to Choir - Bestow 3 Automaton energies to ALL friendly automaton on the field with 4 rounds duration CD

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Universal Buff: All Promoted Automatons get one energy per triggered threaten-tile.

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9+ hit increase for MC ruler. 18+ hit increase for mono on Automatons. Giving them higher chance to hit more elusive targets.