Cast Desperate Ritual by paying ({1} magic symbol) ({R} magic symbol) and choosing to pay ({2} magic symbol) ({R} magic symbol) ({R} magic symbol) and reveal Through the Breach from your hand, adding Through the Breach's effects to Desperate Ritual.
Holding priority, activate Rootha by paying ({2} magic symbol) and returning it to your hand, copying Desperate Ritual.
Resolve the copy of Desperate Ritual, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) and putting Rootha from your hand onto the battlefield.