If your third spell has the Cascade keyword, add it to the Stack, finish resolving the previous Stack trigger, resolve the third Cascade, and then resolve the spells in a similar order as shown above
The One Ring is still that good, and you can get it in a normal, cheaper version if you want it
For anyone scouring the galaxy, you could even get your gloves on something infinitely mighty: a Headliner card, The Soul Stone
Snapcaster Mage 4.5 This guy is the best card printed for cube for quite a while
It has several great reprints, including Thousand-Year Elixir (the most valuable card in the deck at $15), Hellkite Tyrant, Boros Charm, and Sculpting Steel
Salt Road Skirmish