可否通过储法戒指来施展魔法恒定术?

[donkey]

A wizard could cast two magic missile spells and a mage armor
spell into the ring (1 + 1 + 1 = 3). She could then give the ring to a
druid, who casts the mage armor spell from the ring and then puts
a calm animal spell into the ring. The druid could give the ring to a
barbarian, who could use all the spells but could not replace any.

从戒指里放也是cast啊