Rulings

• 2016-09-20
  While Combustible Gearhulk's triggered ability is resolving, no player may take any actions other than those specified by the Gearhulk. Once the opponent makes a choice, players can't cast spells or activate abilities until after the cards are drawn or put into the graveyard and damage has been dealt (if applicable).
• 2016-09-20
  If you have fewer than three cards in your library, the opponent may choose to have you draw three cards. If so, you'll lose the game as state-based actions are performed.
• 2016-09-20
  If any of the cards put into your graveyard have in their mana cost, X is considered to be 0.
• 2016-09-20
  If you have fewer than three cards in your library, the opponent may choose to have you draw three cards. If so, you’ll lose the game as state-based actions are performed.
• 2016-09-20
  While Combustible Gearhulk’s triggered ability is resolving, no player may take any actions other than those specified by the Gearhulk. Once the opponent makes a choice, players can’t cast spells or activate abilities until after the cards are drawn or put into the graveyard and damage has been dealt (if applicable).