All of this is to say that Oko is extremely hard to answer in combat, so it largely requires a spell to deal with it (or, as we see in Throne of Eldraine Standard, you can go way over the top of its threat generation by, for example, making lots of 2/2s with Field of the Dead)
A bit disappointing in that regard, but honestly if Lonis didn't have an activated ability at all she'd still be amazing due to the triggered ability
Olivier Ruel took fifth at Grand Prix: Copenhagen 2005 with it: "Erayo Affinity" Creatures (21) 2 Myr Enforcer 3 Arcbound Ravager 4 Arcbound Worker 4 Frogmite 4 Ornithopter 4 Erayo, Soratami Ascendant Spells (22) 2 Cabal Therapy 4 Thoughtcast 2 Scale of Chiss-Goria 3 Pithing Needle 3 Talisman of Dominance 4 Chromatic Sphere 4 Cranial Plating Lands (18) 2 Underground River 4 Blinkmoth Nexus 4 Darksteel Citadel 4 Seat of the Synod 4 Vault of Whispers Yes, with Erayo and Pithing Needle, Saviors of Kamigawa contributed loads of cards to affinity decks
1 Faldorn, Dread Wolf Herald
Thats a huge step up for a $13 card
Espeon's version from the Pokmon POP Series 5 Cards is particularly breathtaking, featuring gorgeous artwork that perfectly captures the shiny green psychic fox's elegance