Quote from Stapler »Ral, Storm Conduit's -2 ability is the link you are missing, I believe. Use the -2, then cast Doublecast, causing Ral's delayed trigger from the -2 to trigger, copying Doublecast. Let just that copy resolve, then cast any Fork variant targeting the original Doublecast still on the stack. The delayed trigger from the copied and resolved Doublecast will trigger, doubling your Fork, which you use to copy the Fork still on the stack, resulting in infinite copies and Ral triggers.
Quote from Card Slinger J »Ral, Storm Conduit + Doublecast + Expansion // Explosion = Infinite damage.
Quote from Relaxed1 »would Kiki-Jiki, Mirror Breaker and Aurelia, the Warleader = infinite combat steps ?