Testing some of the new Shards, Shard of Readiness is correct on-card but uses random quanta when cast. Meaning, the card lists 3
for casting cost but upon click SoR in-hand (no quanta change, per standard spell mechanics) then selecting target, 3 :other quanta is consumed.
Also, regarding SoR, when clicking SoR in-hand and then "Cancel" button, no quanta is consumed (spell mechanics, standard) and then 3
quanta is refunded / generated.