Yes, you have to discard three random cards at your next upkeep, but in an ideal world, the three cards you draw can all be used before your next upkeep, leaving you with just lands or an empty hand to discard.
Black provides you with creature and planeswalker removal , while green hits artifacts and enchantments

Amber/Emerald Starter Deck List Cubby - Mighty Lost Boy (x3) Dalmatian Puppy - Tail Wagger (x5) Don Karnage - Prince of Pirates (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) Patch - Intimidating Pup (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) De Vil Manor - Crueella's Estate (x3) Neverland - Mermaid Lagoon (x2) You can see the full Amber/Emerald starter deck list below via The Laughing Place

Buy a friend who's showing a preference for black and green their own Witherbloom theme booster, and they have a decent pool of cards ready to go.
So the fix here is relatively simple: the toploader goes between two pieces of stiff cardboard, taped so nothing moves in transit
Opponent : Each time a player shuffles his or her deck, he is supposed to present it to his or her opponent to shuffle