Theyre low investment decks that often want you to play less in-demand cards
Tidus, Yuna's Guardian* The commander deck version of Tidus is all about counters and moves them around during your turn, and provides significant card draw and proliferation capability

Advanced Search Sets Random Syntax Aggression Angelic Destiny Archetype of Courage Armament of Nyx Asha's Favor Aspect of Manticore At Knifepoint Battle Mastery Bleeding Effect Blink Cartouche of Solidarity Celestial Archon Chromanticore Claws of Valakut Commanding Presence Concerted Effort Crown of Fury Daybreak Coronet Dragon Grip Dub Eidolon of Obstruction Ethereal Armor Face of Divinity Fencer's Magemark Fire-Rim Form First Come, First Served Fists of the Demigod Flaming Sword Galvanic Arc Ghostblade Eidolon Go-Shintai of Ancient Wars Hand of Enlightenment Hope Against Hope Hyena Umbra Indrik Umbra Kamahl's Desire Knighthood Lance Lashknife Lightning Reflexes Lightning Talons Love on the Battlefield Mammoth Harness Mardu Runemark Military Discipline Natural Emergence Nature's Blessing Noble Steeds Opal Champion Origin of Captain America Path of Mettle Rageform Reflexes Rise of the Hobgoblins Rowan's Talent Runes of the Deus See Red Shadow Lance Siege Modification Snow Devil Spearpoint Oread Spiteful Motives Stensia Masquerade Summon: Ixion Super Speed Super-Soldier Serum The Night of the Doctor Tidal Flats Triumph of Gerrard Twinblade Blessing Vow of Lightning Wings of Aesthir

Once The Soul Stone is harnessed, harnessing it again has no additional benefit
Westvale Abbey / Ormendahl, Profane Prince Westvale Abbey has a black color identity so it can't be played in every deck, but Ormendahl, Profane Prince is certainly worth going after in decks that can play it
Other Budget Upgrades To Consider Tricky Terrain is focused almost entirely on lands, but Omo's ability works just as well on creatures