Technically, this combo will be legal in Standard
The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was
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I love it in ramp to win the game and make your other big stuff trample, madness, discard matters, Golgari self-mill, Jund's Lord Windgrace lands return to the battlefield from the graveyard, Sultai's self-milling Sidisi, Brood Tyrant, blink, midrange, tokens, and loads more
If you have a Cube or Commander collection these will definitely stand out among them
The upside of Engulf the Shore is that it's instant speed, which lets us leave up countermagic and then bounce all creatures at the end of our opponent's turn