Equip Rule 702.6 Glossary

A keyword ability that lets a player attach an Equipment to a creature they control. See rule 301, “Artifacts,” and rule 702.6, “Equip.”
Flying Rule 702.9 Glossary

A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Intimidate Rule 702.13 Glossary

A keyword ability that restricts how a creature may be blocked. See rule 702.13, “Intimidate.”
Trample Rule 702.19 Glossary

A keyword ability that modifies how a creature assigns combat damage. See rule 702.19, “Trample.”
Transform Rule 701.27 Glossary

To turn a double-faced card so its other face is up. See rule 701.27, “Transform.”

Rulings (4)

January 22, 2011 Wizards of the Coast
The "legend rule" checks only for permanents with exactly the same name. Elbrus, the Binding Blade and Withengar Unbound can be on the battlefield at the same time without either going to its owner's graveyard.
January 22, 2011 Wizards of the Coast
In a multiplayer game using the limited range of influence option (such as a Grand Melee game), if a spell or ability says that you win the game, it instead causes all of your opponents within your range of influence to lose the game. This is another way by which Withengar's ability can trigger.
January 22, 2011 Wizards of the Coast
Withengar's triggered ability will trigger no matter how a player loses the game: due to a state-based action (as a result of having a life total of 0 or less, trying to draw a card from an empty library, or having ten poison counters), a spell or ability that says that player loses the game, a concession, or a game loss awarded by a judge.
January 22, 2011 Wizards of the Coast
Elbrus will transform even if you are unable to unattach it (most likely because the equipped creature died).

Other Printings