Wait until a rebate for the treasure (I think every seals rebate is a GNW treasure rebate anyway) and for you to have saved 264 seal scrolls. The rebate gives you "real" seal scrolls that also count towards itself - so with the rewards from 10, 50, 100 and 200 pulls (1, 5, 10 and 20 scrolls, equaling 36 total) drawing 264 scrolls plus the ones you get back puts you to 300, netting you the 30 extra scrolls from that milestone.

Jinpachi, Sasori, and Founder Madara are far from "extinct".