Heroes are a fairly scant archetype, but that just makes the deck easier to upgrade since you only really need to buy packs of Spider-Man and Marvel Super Heroes

Rime, Runerigus, Milcery, Alcremie, Falinks, Pincurchin, Snom, Frosmoth, Stonjourner, Eiscue, Indeedee, Morpeko, Cufant, Copperajah, Dracozolt, Arctozolt, Dracovish, Arctovish, Duraludon, Dreepy, Drakloak, Dragapult, Zacian, Zamazenta, Eternatus, Kubfu, Urshifu, Zarude, Regieleki, Regidrago, Glastrier, Spectrier, Calyrex, Sprigatito, Floragato, Meowscarada, Fuecoco, Crocalor, Skeledirge, Quaxly, Quaxwell, Quaquaval, Lechonk, Oinkologne, Tarountula, Spidops, Nymble, Lokix, Pawmi, Pawmo, Pawmot, Tandemaus, Maushold, Fidough, Dachsbun, Smoliv, Dolliv, Arboliva, Squawkabilly, Nacli, Naclstack, Garganacl, Charcadet, Armarouge, Ceruledge, Tadbulb, Bellibolt, Wattrel, Kilowattrel, Maschiff, Mabosstiff, Shroodle, Grafaiai, Bramblin, Brambleghast, Toedscool, Toedscruel, Klawf, Capsakid, Scovillain, Rellor, Rabsca, Flittle, Espathra, Tinkatink, Tinkatuff, Tinkaton, Wiglett, Wugtrio, Bombirdier, Finizen, Palafin, Varoom, Revavroom, Cyclizar, Orthworm, Glimmet, Glimmora, Greavard, Houndstone, Flamigo, Cetoddle, Cetitan, Veluza, Dondozo, Tatsugiri, Annihilape, Clodsire, Farigiraf, Dudunsparce, Kingambit, Great Tusk, Scream Tail, Brute Bonnet, Flutter Mane, Slither Wing, Sandy Shocks, Iron Treads, Iron Bundle, Iron Hands, Iron Jugulis, Iron Moth, Iron Thorns, Frigibax, Arctibax, Baxcalibur, Gimmighoul, Gholdengo, Wo-Chien, Chien-Pao, Ting-Lu, Chi-Yu, Roaring Moon, Iron Valiant, Koraidon, Miraidon, Walking Wake, Iron Leaves, Dipplin, Poltchageist, Sinistcha, Okidogi, Munkidori, Fezandipiti, Ogerpon, Archaludon, Hydrapple, Gouging Fire, Raging Bolt, Iron Boulder, Iron Crown, Terapagos, Pecharunt Bulbasaur, Ivysaur, Venusaur, Charmander, Charmeleon, Charizard, Squirtle, Wartortle, Blastoise, Caterpie, Metapod, Butterfree, Weedle, Kakuna, Beedrill, Pidgey, Pidgeotto, Pidgeot, Rattata, Raticate, Spearow, Fearow, Ekans, Arbok, Pikachu, Raichu, Sandshrew, Sandslash, Nidoran, Nidorina, Nidoqueen, Nidoran, Nidorino, Nidoking, Clefairy, Clefable, Vulpix, Ninetales, Jigglypuff, Wigglytuff, Zubat, Golbat, Oddish, Gloom, Vileplume, Paras, Parasect, Venonat, Venomoth, Diglett, Dugtrio, Meowth, Persian, Psyduck, Golduck, Mankey, Primeape, Growlithe, Arcanine, Poliwag, Poliwhirl, Poliwrath, Abra, Kadabra, Alakazam, Machop, Machoke, Machamp, Bellsprout, Weepinbell, Victreebel, Tentacool, Tentacruel, Geodude, Graveler, Golem, Ponyta, Rapidash, Slowpoke, Slowbro, Magnemite, Magneton, Farfetchd, Doduo, Dodrio, Seel, Dewgong, Grimer, Muk, Shellder, Cloyster, Gastly, Haunter, Gengar, Onix, Drowzee, Hypno, Krabby, Kingler, Voltorb, Electrode, Exeggcute, Exeggutor, Cubone, Marowak, Hitmonlee, Hitmonchan, Lickitung, Koffing, Weezing, Rhyhorn, Rhydon, Chansey, Tangela, Kangaskhan, Horsea, Seadra, Goldeen, Seaking, Staryu, Starmie, Mr

This keeps Polymorph fodder up, all while having creatures in the air that can attack for damage if need be.
If we mortals trapped in the real world could simply give this jovial Rowlet a hug, world peace would no doubt become not only feasible, but a reality