Echo Chamber

Oracle Text

4, T: An opponent chooses target creature they control. Create a token that's a copy of that creature. That token gains haste until end of turn. Exile the token at the beginning of the next end step. Activate this ability only any time you could cast a sorcery.

Card Rulings

10/4/2004 The token enters the battlefield as the creature it is copying. This triggers its own and any other appropriate enters the battlefield abilities.
4/1/2008 The effect only grants Haste until the end of the current turn. If the creature somehow manages to stick around until a later turn, it will no longer have Haste.

Additional Information