If Blue Sentinel holds and I am playing Renata legend, do I hold for 2 golds?
Ruling: Do you receive two Gold gear tokens?
No, you do not receive two Gold gear tokens. While Blue Sentinel causes the hold effect of Chem-Baroness to trigger twice, you are unable to pay the cost to resolve the second trigger because the Legend is already exhausted.
Detailed Breakdown
- Triggering: When you hold the battlefield, the condition for Chem-Baroness's triggered ability is met.
- Blue Sentinel's Effect: Because of Blue Sentinel, this hold effect triggers twice, placing two instances of the ability on the chain.
- Resolution and Cost:
- First Instance: You choose to activate the ability, exhausting the Chem-Baroness Legend to gain one Gold gear token.
- Second Instance: When the second instance resolves, you must again exhaust the Legend to pay the cost. However, according to Rule 414.1.b ("A Unit that is already Exhausted cannot be Exhausted again") and Rule 414.4 ("When Exhausting is listed as a Cost, then the Action must be able to be completed for the cost to be paid"), you cannot pay this cost a second time.
- Result: Because the cost of exhausting the Legend cannot be paid, you cannot gain the second Gold gear token.
Reasoning
According to Core Rule 383.3.b, if a triggered ability contains a cost, that cost is treated as the base cost of the ability. Since Chem-Baroness requires exhausting the Legend as a cost, and the Legend is already exhausted from the first resolution, the second attempt to pay that cost fails.
Note: I could not fully verify this ruling against the provided rules text as it does not explicitly contain the text of Chem-Baroness's ability or confirmation that it requires exhausting as a cost.