Homestuck: Mechanics

Prototype: (This ability triggers only once while this card is face-up on the field.) Used on 0 cards:

Prototype is a one-time triggered effect that occurs either the first time a creature you control enters the battlefield, dies, or attacks, depending on the color of the card that has it.

Upgrade: PARAM1: Put a level counter on this. Upgrade only as a sorcery. Used on 1 cards: Bowkind Strife Specibus

Upgrade works with the return of Level up, now on equipment cards, to let players unlock progressively more powerful equipment. These show up on colored artifacts in all 5 colors as well as colorless equips, but the strategy is best supported in blue-white.

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}()]".