And yet, his card is a bit pants
Here are a few examples - If you have Najeela, the Blade-Blossom in play, Bear Umbra attached to her, and lands capable of producing WUBRG mana, you can generate infinite combat phases, creature tokens, and lifegain
Also note that this works for opposing stuff as well

Sort Rarity Card Type Beedrill V #1Ultra Rare $1.01 Hisuian Voltorb #2Common $0.11 Hisuian Electrode #3Uncommon $0.18 Scyther (004) #4Common $0.19 Scyther (005) #5Common $0.05 Yanma #6Common $0.06 Yanmega #7Uncommon $0.08 Heracross #8Common $0.09 Kricketot #9Common $0.07 Kricketune #10Uncommon $0.16 Combee #11Common $0.15 Vespiquen #12Rare $0.14 Leafeon #13Rare $0.30 Shaymin #14Rare $0.21 Petilil #15Common $0.12 Hisuian Lilligant #16Holo Rare $0.23 Hisuian Lilligant V #17Ultra Rare $0.81 Hisuian Lilligant VSTAR #18Ultra Rare $1.74 Rowlet #19Common $0.11 Dartrix #20Uncommon $0.12 Ponyta #21Common $0.18 Rapidash #22Rare $0.21 Cyndaquil #23Common $0.18 Quilava #24Uncommon $0.19 Heatran V #25Ultra Rare $0.85 Heatran VMAX #26Ultra Rare $1.72 Radiant Heatran #27Radiant Rare $0.47 Psyduck #28Common $0.23 Golduck #29Uncommon $0.13 Starmie V #30Ultra Rare $0.98 Swinub #31Common $0.09 Piloswine #32Uncommon $0.05 Mamoswine #33Rare $0.22 Mantine #34Common $0.14 Barboach #35Common $0.05 Whiscash #36Uncommon $0.23 Regice #37Rare $0.22 Glaceon #38Rare $0.31 Origin Forme Palkia V #39Ultra Rare $0.81 Origin Forme Palkia VSTAR #40Ultra Rare $1.39 Oshawott #41Common $0.18 Dewott #42Uncommon $0.15 Hisuian Basculin #43Common $0.12 Hisuian Basculegion #44Rare $0.19 Keldeo #45Holo Rare $0.29 Radiant Greninja #46Radiant Rare $4.14 Bergmite #47Common $0.07 Hisuian Avalugg #48Rare $0.19 Galarian Mr

The trade-off: youre buying from individual Japanese retailers, not a single curated storefront
Zulaport Cutthroat and Blood Artist are the most obvious inclusions here, along with Elenda, the Dusk Rose