Rite of the Raging Storm creates tokens that sacrifice themselves at the end of your opponents turn, and, while they dont necessarily have to attack each turn, but theres little reason not to send it in at another player.Even if they dont attack, the token will still trigger effects that happen when a creature dies, like Morbid Opportunist
Airship Engine Room Airship Engine Room is a solid and useful dual land that also represents a second card you can draw or replenishes your hand with that last spell you need
As if all that wasnt enough, Muldrotha also packs some tasty incidental combo lines
These decks often include red, splash blue, deck wins, counter burn, UW weenie, UB fairies style agro control and various mono blue creature decks with things like Vedalken Shackles, Grand Architect and Opposition