A copy other spells card also gets significantly better with flashback
To trigger landfall twice per turn, the best way is to sacrifice Lander tokens, so those go up in value in red-green
Ariel, On Human Legs x2 Cinderella, Gentle and Kind x2 Hades, Lord of the Underworld x1 Heihei, Boat Snack x2 Maximus, Relentless Pursuer x2 Mickey Mouse, True Friend x3 Minnie Mouse, Beloved Princess x3 Moana, Of Motunui x1 Stitch, New Dog x3 Be Our Guest x2 Control Your Temper x2 Hakuna Matata x2 Part of Your World x1 Dinglehopper x3 Dr
Unsurprisingly, just like Treasure Cruise, Dig Through Time is also banned in Modern and Legacy
Its one of those decks you buy because you want to play the strategy included in it and upgrade it based on that strategy