Anointed Procession, Ixalan's Binding and Sram's Expertise
Hi,
Thanks for your question. You follow the instructions for the Expertise in the order they're written on the card. First, you create the three tokens (and there's no Procession on the battlefield yet). Then, you can cast the Ray. The Expertise finishes resolving, and the Ray ends up as the only spell on the stack. When the Ray resolves, the Binding is destroyed and the Procession enters the battlefield, but much too late to double the number of tokens made by the Expertise.
In short - you get the tokens before the Procession returns, so you get three tokens, not six.
Thanks,
Nathan Long
Magic Rules NetRep