It looks like waterstone was added in Dec 1999, and "new magician spells" were added in the PoS update in Jan 2000. That said, Renew Summoning looks like it's likely to come in the Paineel update, whenever that hits.
The last update we got on green was the PoH update which was originally in November 1999.
EDIT: I've updated the wiki for the spell with that information at the top, but we won't know for sure until it actually drops.
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