Creature - Elemental 3/4, 3UU (5) {U}: Quicksilver Elemental gains all activated abilities of target creature until end of turn. (If any of the abilities use that creature's name, use this creature's name instead.) You may spend blue mana as though it were mana of any color to pay the activation costs of Quicksilver Elemental's abilities.1
Illus. Tony Szczudlo
Treat the target creature's name in the copied abilities as having Quicksilver Elemental's name there instead. [Mirrodin FAQ 2003/10/01]
You can play the ability more than once, collecting abilities from multiple creatures (or the same creature more than once). [D'Angelo 2003/10/17]
If you make two copies of an ability that can be played once a turn, you can play each of them once a turn. [Barclay 2003/10/10]
If you use this card to gain Wall of Deceit's ability to turn itself face down, you will not be able to turn this card face up because it will not have the Morph ability. [WotC Rules Team 2003/12/01]
Mirrodin
(Rare)