UBW: Mechanics

Money Match: Whenever a creature dies from combat damage dealt by CARDNAME, opponents lose PARAM1 life. If CARDNAME dies from combat damage, you lose PARAM1 life. Used on 0 cards:

Backlog: Rather than cast this spell from your hand, you may pay PARAM1 and exile it. You may play it as though it were in your hand without paying its cost. If you do, copy its effect for each card exiled with Backlog you control. Used on 0 cards:

Long term stacking storm.

Senpai: Whenever CARDNAME deals combat damage, put a rank counter on CARDNAME. At the beginning of your upkeep, you may tap CARDNAME to give target creature you control +X/+X so long as CARDNAME remains tapped, where X is the number of rank counters on CARDNAME. If you do, CARDNAME doesn't untap next turn. Used on 0 cards:

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}()]".