Alright, so from what I tested with Shard of Readiness using Anubis:
I play Anubis, then SoR. I can quint two creatures. Using another SoR same turn does nothing.
I play Anubis and wait a turn. Next turn I quint a creature, then use SoR to quint two more.
I play Anubis and SoR, then quint two creatures. Next turn, I use another SoR and quint two more.
Are all of these correct? If so, then the maximum uses are 3 in one turn after the one turn sickness has passed.