When playing a hidden card with Viktor Blue in play, does Viktor's 'when you play a card' ability trigger when the hidden card is placed on the battlefield or when it is revealed?

Ruling: Viktor's ability triggers when the card fully resolves (completes the play process), not when it is initially revealed or placed.

Sequence:

• Hidden card is revealed (Pending state)
• All choices are made and costs paid (Finalized state)
• Card effect is implemented and removed from chain (Resolved state)
• Viktor's "when you play a card" ability triggers after the card is fully resolved

Nuances:

• If the hidden card is countered (e.g., by Defy), it never fully resolves, so Viktor's ability would not trigger and no token would be created