Rule 416.6

This action, when instructed, is sometimes formatted as "Recycle X from [Zone]." That means to take X cards of the instructed player's choice from the relevant zone and recycle them. Such an instruction does not target the recycled cards. Example: Dr. Mundo, Expert has the ability "At the start of your Beginning Phase, recycle 3 from your trash." As that ability resolves, its controller recycles 3 cards from their trash. If there are fewer than 3 cards in that player's trash, they recycle as many as they can.