"If you do" templating is more particular, as seen in cards like Jayce, Man of Progress whose triggered ability begins with, "When you play me, you may kill a friendly gear. If you do, ..." Killing the friendly gear in this case is not a cost for the ability, but a game action that a later instruction checks. If the game action is not performed or is replaced, the later instruction will not have its condition fulfilled - the player didn't "do" it, so "if you do" is not true.
![Riftbound Unit: Jayce, Man of Progress. When you play me, you may kill a friendly gear. If you do, you may play a gear with Energy cost no more than [7] from hand this turn, ignoring its Energy cost. (You must still pay its Power cost.)](https://cmsassets.rgpub.io/sanity/images/dsfx7636/game_data_live/b508fa4e52ebbd5f66e1fc7df28cfb70acdfe1f5-744x1039.png?accountingTag=RB&w=744&fm=webp)
Full card detail
Jayce, Man of Progress
Has FAQ
- Energy
- 4
- Might
- 4
- Power
- -
Ability
When you play me, you may kill a friendly gear. If you do, you may play a gear with Energy cost no more than [7] from hand this turn, ignoring its Energy cost. (You must still pay its Power cost.)
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Official references
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