From the card:
Quote:
Body Rebuilder
Ability:
Flaunt – Target Undead Monster gains 2 power for this fight. Discard this.
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From the rules:
Quote:
Flaunt
A keyword ability. An ability that activates from a player's hand after it is revealed to their opponent. A Flaunt ability can be interrupted, and that card is in play until its ability is resolved.
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This works by using the Flaunt ability of Body Rebuilder
from your hand during a fight where an Undead monster is involved. After you reveal Body Rebuilder to your opponent, it is discarded and the Undead monster in the fight gains 2 power for the duration of the fight.