If your opponent casts Murder on one of your creatures, you either prevent it from happening or get to do it to one of their creatures
Banned and Restricted Cards Banned : Contract from Below, Darkpact, Demonic Attorney, Mind Twist Restricted : Channel, Copy Artifact, Disrupting Scepter, Earthquake, Fork, Mana Short, Stasis Media You can find more information about this format on their Facebook Group and several relevant links in this spreadsheet.
I found myself using this hidden "fourth ability" at least once a match
The chart is a production-composition disclosure, not a per-pack pull-rate table
Honorable Mention When the SCG Tour ran their No Ban List Modern Open at SCG CON a few years back, one of the decks that floated to the top in heavy-ish numbers was Dark Depths