Code Geass archive: Mechanics

Subjugate: You may pair this creature with another unpaired creature an opponent controls when either enters the battlefield. They remain paired for as long as both are on the battlefield. Used on 9 cards: Brutal Coercers, Occupation Grunts, Detainment Officer, Enforcer of the Peace, Silvertongued Prince, Cruel Viceroy, Exploitative Industrialist, Prison Warden, Spiteful Warden

"Enemy soulbond", a potential Britannian mechanic as suggested by Nich Grayson. Playtested and discovered to be problematic: see Incursion Force.

Set in Motion: {2}

: Exile this card face down from your hand with two time counters on it. At the beginning of your upkeep, remove a time counter. While it has exactly one time counter, you may cast it without paying its mana cost. Set in Motion only as a sorcery. Used on 4 cards: Plan for Survival, Plan for Infiltration, Plan for Ambush, Plan for Readiness

Turned out too wordy.

*Overthrow* — At the beginning of your postcombat main phase, if an opponent was dealt 4 or more combat damage this turn: Used on 8 cards: Rebel Strategist, Incensed Underdog, Firebrand Revolutionary, Rebel Recruiter, Mob of Elevens, Vicious Terrorist, Supply Thieves, Subversive Infiltrator

Larry Paulsen's Overthrow mechanic.

Squad: When you cast this, you may search your library for any number of cards named ~ and put them into your hand. Then shuffle your library. Used on 1 cards: Glasgow RP-11

A mechanic trying to allow the mecha to travel in groups. Goes with "Equip nonequipped creature".

Eject: If equipped creature would be destroyed, instead remove all damage from it and destroy this Equipment. Used on 1 cards: Glasgow RP-11

Most Knightmares will save their pilot if the Knightmare gets destroyed in battle.

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}()]".