does legion trigger if the card was countered?
Yes, Legion triggers if the card that satisfied the condition was countered.
According to RiftJudge FAQ #9461 and #9463:
- Legion checks whether a card has been Finalized on the chain, not whether it successfully resolved.
- When you play a card, it is placed on the chain as a "Pending Chain Item."
- Once you choose targets and pay all costs, the card becomes a "Finalized Chain Item."
- Players then have the opportunity to play Reaction cards, such as Defy (to counter).
- Because the counter is played after the card has already been finalized, the Legion condition is already met for the turn. Even though the card is subsequently countered and removed from the chain (per Rule 425.1.a), the requirement for Legion has been satisfied.