Or is a keyword which is used when there is more than one condition. It means that if any of the conditions are true, the Cost/Action will happen.
Moonlight Rose Dragon - http://yugioh.wikia.com/wiki/Black_Rose_Moonblossom_Dragon
- Condition Trigger
- MOVE Me CAUSE Method:Special Summon
- Condition Trigger Or
- MOVE Range:1 FROM Level:>=5 TO Area:Monster, Side:Opponent CAUSE Method:Special Summon
- MOVE Range:1 FROM Area:Monster, Side:Opponent, History:Special Summon TO Area:Hand CAUSE Method:Return