You can use the lore tracker included with the Disney Lorcana starter decks, the games official companion app or simply another way of counting to 20, such as a dice or piece of paper

Ruby/Sapphire Into the Inklands Starter Deck Cogsworth - Talking Clock (x2) Della Duck - Unstoppable Mom (x3) Dewey - Showy Nephew (x2) Duke Weaselton - Small-Time Crook (x2) Flintheart Glomgold - Lone Cheater (x2) Flounder - Voice of Reason (x3) Gramma Tala - Keeper of Ancient Stories (x3) Gyro Gearloose - Gadget Genius (x1) HeiHei - Accidental Explorer (x3) Huey - Savvy Nephew (x1) Kakamora - Menacing Sailor (x3) Louis - Chill Nephew (x3) 003-150 (x2) Maui - Winged Demigod (x3) Minnie Mouse - Always Classy (x2) Moana - Born Leader (x1) Moana - Undeterred Voyager (x3) Scrooge McDuck - Richest Duck in the World (x1) Scrooge McDuck - Uncle Moneybags (x2) Simba - Scrappy Cub (x1) Webby Vanderquack - Enthusiastic Duck (x3) Dragon Fire (x2) Voyage (x2) Maui's Fish Hook (x1) Sumerian Talisman (x2) Vault Door (x2) Agrabah - Marketplace (x3) Motunui - Island Paradise (x2) Amber/Emerald Into the Inklands Starter Deck Cubby - Mighty Lost Boy (x3) Dalmatian Puppy - Tail Wagger (x5) 003-071 (x2) Flotsam - Riffraff (x2) Helga Sinclair - Vengeful Partner (x1) Horace - No-Good Scoundrel (x2) Jasper - Common Crook (x2) Jetsam - Riffraff (x2) Kida - Atlantean (x3) Kit Cloudkicker - Tough Guy (x2) Lucky - The 15th Puppy (x1) Nani - Protective Sister (x2) 003-014 (x3) Peter Pan - Lost Boy Leader (x1) Pluto - Determined Defender (x1) Pluto - Friendly Pooch (x3) Pongo - Determined Father (x1) Robin Hood - Daydreamer (x1) Rolly - Hungry Pup (x3) Starkey - Devious Pirate (x1) Tinker Bell - Generous Fairy (x2) Wendy Darling - Talented Sailor (x3) Wildcat - Mechanic (x2) Strike a Good Match (x2) Hypnotize (x2) Improvise (x3) 003-100 (x3) 003-032 (x2)

It balances Ambers supportive healing with Amethysts control spells, letting you build Lore while slowing down your opponent
Once we had played several games with each deck, we decided to try separating out the inks and mixing and matching something that you really cant do with starter decks in other card games
There arent specific scenarios where A Whole New World is a must-have
Summon: Primal Odin asks you whether you would like a Phlage for two turns, or maybe more, its okay, you wont lose the game if you reanimate it