When Forge of the Future recycles 4 cards at once, does Karma trigger 4 times (buffing 4 units) or only once?

Ruling: Karma only triggers once when Forge of the Future recycles multiple cards, because all the recycles happen simultaneously as a single instance.

Nuances:

• For Karma to trigger multiple times, the effect would need to be worded as a reflexive trigger that recycles cards one at a time in sequence (like "do this 4 times")
• Vi works well with Karma because Vi recycles one card at a time, triggering Karma multiple times