From Guild Wars 2 Wiki
Reindeer Tonic is a tonic introduced during Wintersday 2012.“Double-click to transform into a reindeer. You will be unable to fight while transformed.
— In-game description
 Costume Brawl Skills
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|1||Frantic Frolic||1||2||Costume Brawl Skill|
|2||Glow||½||4||Costume Brawl Skill|
|3||Dash||1¾||30||Costume Brawl Skill|
|4||Powerful Prance||2¼||15||Costume Brawl Skill|
|5||Enter Costume Brawl||Toggle to enter Costume Brawl.|
|Time Out||2||Leave Costume Brawl so that you cannot be attacked. Requires an active Costume Brawl.|
- This transformation lasts one hour.