If Viktor leader dies with another unit, how many tokens do I create?

If Viktor, Leader dies at the same time as another unit you control, you create zero tokens.

According to the Riftbound rules and multiple RiftJudge FAQs (such as FAQ #7662, #4253, and #7419), this is because:

1. Simultaneous Events: When units die simultaneously (such as in combat or from a board wipe), they do not "see" each other die.
2. Trigger Condition: Viktor's ability ("When another non-Recruit unit you control dies...") requires him to be on the board to evaluate the condition and trigger.
3. Zone Requirement: Because Viktor dies at the same time as the other unit, he is already in the trash when the game checks for triggered abilities. Since he is no longer on the board, he cannot see the other unit die, and his ability does not trigger.

As stated in Rule 383.2.c.2: "A Game Object will not be able to successfully be able to evaluate its Trigger Condition, however, if it leaves the zone that its Trigger is active from at the same time that its Trigger is satisfied."