Combustible Gearhulk and Split Cards
When resolving the Enter the Battlefield Trigger of "Combutible Gearhulk", if your opponent chooses to mill 3 cards and take damage equal to their total converted mana cost, if any "Split" cards are milled (for example "Rough / Tumble") it will consider these cards to have a converted mana cost of zero.
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Offbeat_Hero#82238 commented
When resolving the Enter the Battlefield Trigger of "Combutible Gearhulk", if your opponent chooses to mill 3 cards and take damage equal to their total converted mana cost, if any "Split" cards are milled (for example "Rough / Tumble") it will consider these cards to have a converted mana cost of zero.