13 cards where it’s legal in Pauper and the cards are on the Reserved List

Aeolipile (Masters Edition II #202)
Anaba Ancestor (Masters Edition III #86)
Anaba Spirit Crafter (Masters Edition III #87)
Citanul Druid (Masters Edition IV #146)
Elven Lyre (Masters Edition II #208)
Gravebind (Masters Edition IV #84)
Icatian Lieutenant (Masters Edition #17)
Knights of Thorn (Masters Edition #19)
Lightning Blow (Masters Edition III #18)
Mightstone (Masters Edition IV #215)
River Merfolk (Masters Edition #47)
Telekinesis (Masters Edition #52)
Wall of Kelp (Masters Edition II #74)

The message was clear to Sorin—time to search for something else.