If you have a combat trick, particularly one of the black and white ones that grants indestructible, it is likely worth saving this creature until youre able to hold it up, because if it lives, youre probably going to win the game
Flatline is more casual and can make combat perilous for your opponents
You can read all about it in Collecting Magic: The Gathering Doctor Who

These decks contain: 1 60-card starter deck including 2 foil cards 11 Tokens 1 Rulebook 1 Booster pack containing 12 randomized cards Amber & Sapphire Decklist: 1 Alice - Accidentally Adrift 1 Ariel - Singing Mermaid (Rainbow Foil) 2 Aurora - Holding Court 2 Aurora - Regal Princess 3 Aurora - Tranquil Princess 1 Beast - Gracious Prince 2 Belle - Inventive Engineer 2 Cinderella - Gentle and Kind 3 Cruella De Vil - Fashionable Cruiser 1 Grand Pabbie - Oldest and the Wisest 3 Hans - Noble Scoundrel 3 Jasmine - Heir of Agrabah 2 Julieta Madrigal - Excellent Cook 3 Maid Marian - Delightful Dreamer 3 Mufasa - King of the Pride Lands 1 Mulan - Considerate Diplomat (Rainbow Foil) 3 Mulan - Free Spirit 2 Nani - Protective Sister 3 Pluto - Rescue Dog 3 Rapunzel - Sunshine 1 The Queen - Mirror Seeker 2 Aurelian Gyrosensor 3 Be Our Guest 2 Coconut Basket 1 Dig A Little Deeper 1 Look At This Family 2 Lost in the Woods 2 Motunui - Island Paradise 2 World's Greatest Criminal Mind Emerald & Ruby Decklist: 3 Aladdin - Prince Ali 2 Bobby Zimuruski - Spray Cheese Kid 2 Donald Duck - Perfect Gentleman 3 Donald Duck - Sleepwalker 1 Goofy - Set for Adventure 1 Kuzco - Temperamental Emperor 2 LeFou - Instigator 1 Max Goof - Rebellious Teen (Rainbow Foil) 3 Max Goof - Rockin' Teen 2 Megara - Pulling the Strings 3 Mickey Mouse - Steamboat Pilot 3 P.J

Players chose between two random decks, mixed them, and played
For The Little Mermaid, new cards for Ariel Singing Mermaid and Prince Eric Seafaring Prince are ready to make a splash, along with a new Song Card Poor Unfortunate Souls