Guildforge: Mechanics

Bioengineering: Switch this creature's power and toughness until end of turn. Used on 0 cards:

Used in Simic

Avenge: If an opponent has more cards in hand than you, effect. Used on 0 cards:

Used in Boros.

Rot: You may sacrifice rot counters equal to this card's rot value to play this card without paying its mana cost. Used on 1 cards: Korozda Shambler

Used in Golgari.

Tax: When this creature enters the battlefield, exile a creature you control. When it dies, return that creature to the battlefield under your control. Used on 0 cards:

Used in Orzhov.

Cadence: If this spell is the Xth spell cast this turn, *effect*. Used on 0 cards:

Used in Izzet.

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}()]".