Linked with; http://magicduel.invisionzone.com/topic/10070-memory-stones/page__view__findpost__p__87650
I have the toadspeak spell with 50 casts of it.
As part of a trade with Eon, I agreed to add these to a stone for a fee, he gave me 2 stones, I used the item, added the spell to it and gained a "Toadspeak Stone" item (see previously referenced thread).
When it came to Eon using the stone, he activated it and only got given 3 casts of the spell - I was under the impression that all the casts would be transferred to the player, not that the majority would go missing. And yes, all 50 of my spells are now counted as used.