First strike
When Combustible Gearhulk enters, target opponent may have you draw three cards. If the player doesn’t, you mill three cards, then Combustible Gearhulk deals damage to that player equal to the total mana value of those cards.
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.
20-09-2016
wotc
If any of the cards put into your graveyard have {X} in their mana cost, X is considered to be 0.
20-09-2016
wotc
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).
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.