- Increases in attack will display in your hand. (Source)
- Your opponent will have no indication of you having Bolvar. (Source)
- When silenced, Bolvar loses his attack buff. (Source)
- Bonus attack will reset upon being hit by Sap, Redemption, or Reincarnate. (Source)
- Bolvar is the only target which gains bonus attack, not the hero. (Source)
- Obtaining Bolvar directly from a player's hand, through a spell like Mind Vision, results in the clone being 1/7 even if the originating Bolvar is buffed. (Source)
Whenever a friendly minion dies while this is in your hand, gain +1 Attack.
Spoiler alert: Bolvar gets melted and then sits on an ice throne and everyone forgets about him.