Hands of Binding

If you want to encode the card with cipher onto a noncreature permanent such as a Keyrune that can turn into a creature, that permanent has to be a creature before the spell with cipher starts resolving. You can choose only a creature to encode the card onto.

You cast the copy of the card with cipher during the resolution of the triggered ability. Ignore timing restrictions based on the card's type.

If another player gains control of the creature, that player will control the triggered ability. That player will create a copy of the encoded card and may cast it.

If you choose not to cast the copy, or you can't cast it (perhaps because there are no legal targets available), the copy will cease to exist the next time state-based actions are performed. You won't get a chance to cast the copy at a later time.

If the spell with cipher doesn't resolve, none of its effects will happen, including cipher. The card will go to its owner's graveyard and won't be encoded on a creature.

The copy of the card with cipher is created in and cast from exile.

If a creature with an encoded card deals combat damage to more than one player simultaneously (perhaps because some of the combat damage was redirected), the triggered ability will trigger once for each player it deals combat damage to. Each ability will create a copy of the exiled card and allow you to cast it.

If the creature that was tapped by Hands of Binding is untapped during its controller's next untap step (perhaps because a spell untapped it), Hands of Binding has no effect at that time. It won't apply at some later time when the creature is tapped.

If a different player gains control of the creature that was tapped by Hands of Binding, Hands of Binding will stop that creature from untapping during its new controller's next untap step.