Mana Clash: Mechanics

Possess: When this card is put into a graveyard from play, exile it. Target creature gains all of the abilities of this creature except for Possess as long as it remains on the battlefield. Used on 2 cards: Woeful Spirit, Memory of Immortals

For the W/B pair.

Spellshape: You may return this card from your graveyard to your hand by discarding a card with a higher converted mana cost. Spellshape only as a sorcery. Used on 2 cards: Eter Harbinger, Memory of Djinn

For the U/R pair.

Sluice: You may cast this spell for PARAM1 if you have cast another spell that shares a color with it this turn. Used on 1 cards: Lyrian Forerunner

For the G/U pair.

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}()]".