"Eden": Mechanics

Invoke: Your planeswalkers can help cast this spell. Each loyalty counter you remove while casting this spell pays for {1}

or one mana of that walker's color. Used on 2 cards: Cross Out, Opening the Eye

Lurk: As long as this is untapped, your opponents can't target it. Used on 1 cards: Shadow Dancer

Flux: PARAM1, Discard this card: Create an artifact token named Gold. It has "Sacrifice this artifact: Produce one mana of any color." Flux only as a sorcery. Used on 0 cards:

The token's lack of color omitted on purpose.

by foo_intherain (MTG Salvation)
https://www.mtgsalvation.com/forums/magic-fundamentals/custom-card-creation/615206-ug-alchemy

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}()]".