Root: Mechanics

Building: This permanent can be attacked. If combat damage is dealt to it, it is destroyed. Used on 8 cards: !!!Crafter's Workshop, Cat Recruiter, Recruiting Office, Clearcutter's Shed, Blacksmith's Workshop, UC Black Cat Building, Soup Kitchens, !!!Cat Workshop

Decree: At the beginning of your end step, if you fulfilled all of your Decrees, put a +1/+1 counter on ~. Otherwise, remove all +1/+1 counters from it. Used on 8 cards: Commander Leader, Owl Commander, Eyrie Medium, Help from the Eyrie, !!!Eyrie Brute, !!!Eyrie Aggressor, !!!Eyrie Explorer, Eyrie Hatchling

Plot: Draw PARAM1 cards, then put PARAM1 cards from your hand on top of your library in any order. Used on 7 cards: Corvid Commisioner, Sow Paranoia, Corvid Raid, Corvid Bomb, Corvid Snare, Corvid Extortion, !!!Corvid Snare

Revolution: {t}

, Tap two untapped creatures you control: Transform all permanents with revolution you control. Revolt only as a sorcery. Used on 8 cards: Independent Merchant, Scouting Party, Fox Isolationist, Mini Mouse, Rabbit Disciple, Fox Warrior, !!!Mouse Field-Worker, Community Leaders

Craft an Item.: Put the top card of your Item deck face up onto the battlefield. Used on 6 cards: !!!Fox Shieldcrafter, !!!Cat Workshop, Master Craftsfox, Foxfolk Blueprints, Vagabond's Aid, Feline Exile

In card text or details pages, write the mechanic's code name (playtest name) between square brackets, like "[Crittercast]", "[Bushido 1]" or "[Delay 4 {2}{R}{R}]". It will be expanded to the mechanic's name plus reminder text, such as "Suspend 4 – {2} {r} {r} . (Rather than cast this spell from your hand,...)"
To expand a mechanic's name but not its reminder text, include parentheses at the end of the square brackets: "[Crittercast()]", "[Delay 9 {R}()]".