Gyarados, unfortunately, is costly to use given that its main move requires four Energy, but they do discard your opponents Active Pokemons Energy which can be useful
Ability Word: Lieutenant Lieutenant is an ability word that appears in italics on some creatures that become more powerful if you control your commander

Muldrotha's Budget -- Commander | Abe Sargent Commander (1) 1 Muldrotha, the Gravetide Creatures (29) 1 Baloth Null 1 Caustic Caterpillar 1 Cephalid Sage 1 Coiling Oracle 1 Eidolon of Blossoms 1 Gravedigger 1 Hypnotic Siren 1 Krosan Tusker 1 Mindwrack Demon 1 Mulldrifter 1 Mystic Snake 1 Nighthowler 1 Nimble Obstructionist 1 Perplexing Chimera 1 Rona, Disciple of Gix 1 Sakura-Tribe Elder 1 Satyr Wayfinder 1 Scion of Darkness 1 Shefet Monitor 1 Shriekmaw 1 Stinkweed Imp 1 Stronghold Assassin 1 Sultai Soothsayer 1 Thoughtrender Lamia 1 Thrashing Brontodon 1 Torrent Elemental 1 Undead Gladiator 1 Whisper, Blood Liturgist 1 Wild-Field Scarecrow Planeswalkers (3) 1 Kiora, the Crashing Wave 1 Ob Nixilis Reignited 1 Vraska the Unseen Instants (3) 1 Countervailing Winds 1 Murder 1 Sultai Charm Sorceries (8) 1 Bitter Revelation 1 Cultivate 1 Deep Analysis 1 Far Wanderings 1 Farseek 1 Rise from the Grave 1 Urban Evolution 1 Villainous Wealth Enchantments (11) 1 Animate Dead 1 Compulsion 1 Control Magic 1 Crop Sigil 1 Font of Fortunes 1 Font of Return 1 Lay Claim 1 Seal of Doom 1 Seal of Primordium 1 Sultai Ascendancy 1 The Eldest Reborn This is the first time I've had 3 planeswalkers in my budget build, but I emphasized them early because you can cast them again with your Commander after they inevitably die, and I am spending around $10 of my budget on them, but I think they work here marvelously

Drop by to play, trade, and connect with other trainers
If you are selling played cards, I think the scale tips slightly in favor of eBay (make sure to take pictures and list clearly), followed by TCG, with buylisting bringing up the rear simply because most buylist make heavy deductions for played cards (ranging from $0.70 to $0.30 cents on the dollar)