Does a countered card count for Legion or for Chemtech Cask?

To determine if a countered card counts for Legion or for the ability of Chemtech Cask, we must look at the specific requirements for each.

1. Does a countered card count for Legion?

Yes. According to RiftJudge FAQ #9461, #9463, and #9650, a card counts toward satisfying Legion requirements as soon as it is Finalized on the chain.

• The Sequence: When you play a card, it is a "Pending Chain Item" until you choose targets and pay all costs. At that point, it becomes a "Finalized Chain Item."
• Interaction: Legion checks if a card has been Finalized on the turn (Rule 812.1.c). Since countering occurs after the card has been finalized, the Legion condition is already satisfied for that turn, even if the card is subsequently countered and removed from the chain (Rule 425.1.a).

2. Does a countered card count for Chemtech Cask?

No. Based on the text of Chemtech Cask, a countered card does not trigger its ability.

• Card Text: "When you play a spell on an opponent's turn, you may exhaust me to play a Gold gear token exhausted."
• The Ruling: While Legion relies on the "Finalized" state of a card, Chemtech Cask relies on the action of "playing" a spell. According to Rule 425.1.b, "A card that is Countered is not considered to have been played."
• Reasoning: Because a countered spell is not considered to have been played, the trigger condition for Chemtech Cask ("When you play a spell...") is never met. Therefore, the ability of Chemtech Cask cannot be activated if the spell it would have responded to is countered.

Summary

• Legion: Satisfied by the act of finalizing a card on the chain, regardless of whether that card is later countered.
• Chemtech Cask: Does not trigger, because a countered card is not considered to have been "played."

Note: I could not fully verify the ruling regarding Chemtech Cask against the retrieved rules.