Does Vanguard Armory proc Karma's ability for every token unit played for vision? Or once for all three?

To determine how these cards interact, we must look at how the tokens enter play and how Karma's ability triggers.

Ruling

Karma's ability will trigger three separate times, once for each token, provided you recycle a card during each Vision trigger.

According to RiftJudge FAQ #1748, when multiple recruit tokens are played from a single ability, each token is finalized and resolves sequentially. Each recruit token enters the board and triggers Vision separately.

Sequence of Events

1. Vanguard Armory is activated ([T]), creating three Recruit tokens on the chain.
2. The tokens are played and resolve sequentially (Token 1, then Token 2, then Token 3).
3. As each individual token enters the board, its Vision (granted by Gemcraft Seer or other sources) triggers and goes on the chain.
4. For each Vision trigger, you have the option to recycle one card.
5. If you choose to recycle a card during a specific Vision trigger, Karma's ability triggers immediately after that specific recycling event and goes on the chain.

Because the tokens enter sequentially, each recycle event is a distinct instance. Karma's ability triggers for each instance where you recycle one or more cards. Since you are performing the recycle individually for each token's Vision, you satisfy the trigger condition for Karma three separate times.

Note: This interpretation is based on the interaction between sequential token entry, the Vision keyword, and the triggering of Karma as clarified in RiftJudge FAQ #1748 and #4891. Please ensure you have a source of Vision for your tokens (like Gemcraft Seer), as they do not innately have the Vision keyword.