I fully recommend MTGACodes and Gray Viking Games if you want to buy codes, and eBay isnt a terrible alternative
For some Moves, this even evades the discard clauses
Shefet Dunes Shefet Dunes gives all your creatures +1/+1 at sorcery speed which is, well, pretty good
Aside from Sliver Gravemother, this precon features five new mono-colored slivers, one for each color

Obtainable emblems and number of card dex registrations needed: Genetic Apex (150 cards) Mewtwo (Emblem) Charizard (Emblem) Pikachu (Emblem) Mythical Island (50 cards) Mew (Emblem) Space-Time Smackdown (100 cards) Dialga (Emblem) Palkia (Emblem) Triumphant Light (50 cards) Arceus (Emblem) Shining Revelry (50 cards) Giratina (Emblem) Celestial Guardians (100 cards) Solgaleo (Emblem) Lunala (Emblem) Extradimensional Crisis (50 cards) Buzzwole (Emblem) Eevee Grove (50 cards) Eevee (Emblem) Wisdom of Sea and Sky (100 cards) Ho-Oh (Emblem) Lugia (Emblem) Secluded Springs (50 cards) Suicune (Emblem) Deluxe Pack: ex (100 cards) Greninja (Emblem) Oricorio (Emblem) Mega Rising (150 cards) Mega Blaziken (Emblem) Mega Gyarados (Emblem) Mega Altaria (Emblem) Crimson Blaze (50 cards) Mega Charizard Y (Emblem) Fantastical Parade (100 cards) Mega Gardevoir (Emblem) Ogerpon (Emblem) Paldean Wonders (50 cards) Sprigatito, Fuecoco, and Quaxly (Emblem) Mega Shine (50 cards) Shiny Mega Gengar (Emblem) Attention: Availability periods and details are subject to change without warning.

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