"Work": Mechanics

Dredge: If you would draw a card, instead you may put exactly PARAM1 cards from the top of your library into your graveyard. If you do, return this card from your graveyard to your hand. Otherwise, draw a card. Used on 3 cards: CU05, CG05, CZ20

Existing mechanic

Morbid: Activates an effect upon a death of a creature Used on 0 cards:

existing mechanic

Transfigure: PARAM1, Sacrifice this creature: Search your library for a creature card with the same converted mana cost as this creature and put that card onto the battlefield. Then shuffle your library. Transfigure only as a sorcery. Used on 2 cards: CG01, CZ18

Existing mechanic

Refund: PARAM1, Reveal CARDNAME from your hand: Put CARDNAME on the bottom your library, then draw a card. Used on 3 cards: CW05, CA03, CG04

Cycling that shuffles back into the deck instead.

Cascade: When you cast this spell, exile the top card of your library until you exile a nonland card that costs less. You may cast that card without paying its mana cost. Put the exiled cards on the bottom of your library at random. Used on 2 cards: CZ17, CZ05

Existing mechanic

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}()]".