You can have any number of cards in your sideboard if it's not over 15

Abundant Growth Animal Boneyard Annex Barbed Field Blight Blighted Burgeoning Buried in the Garden Caribou Range Caustic Tar Chamber of Manipulation Chronic Flooding Conquer Consecrate Land Contaminated Ground Convincing Mirage Corrupted Zendikon Crackling Emergence Crusher Zendikon Cursed Land Dawn's Reflection Debtor's Pulpit Discreet Retreat Earthlore Elvish Guidance Equinox Erosion Evil Presence Farmstead Fertile Ground Find the Path Flowering Field Footfall Crater Forbidden Lore Friendly Neighborhood Genju of the Realm Gift of Paradise Glittering Frost Goblin Caves Goblin Shrine Grafted Growth Guardian Zendikon Harmonious Emergence Hostile Realm Hot Springs Kudzu Leafdrake Roost Lingering Mirage Lithoform Blight Living Terrain Lush Growth Market Festival Mystic Might New Horizons Nissa's Zendikon Noxious Field Nylea's Presence Orcish Mine Overgrowth Phantasmal Terrain Pooling Venom Psychic Venom Racecourse Fury Remarkable Readings Sea's Claim Security Blockade Sheltered Aerie Shimmerwilds Growth Skygames Spawning Grounds Spreading Seas Squirrel Nest Steam Vines

Exdeath, Void Warlock transforms into the more powerful Neo Exdeath, Dimension's End which has power equal to the number of permanents in your graveyard
Momentous Fall, Greater Good and Life's Legacy demand the creature to die, so it is important to know when we can kill our commander to have more cards in hand
Includes 2 booster packs, an Eeveelution card, and a collectible quicksand display charm frame with secret variants
I have no serious complaints about this deck