You choose whether to cast the exiled card as Power Pack's delayed triggered ability resolves during your next upkeep
4 Articuno Holofoil Market Price: $32.42 While Zapdos debuted in Pokemon TCGs base set, the other two legendary birds didnt see a TCG appearance until Fossil (where Zapdos also got a new printing)
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
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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)
Despite this seemingly strong effect, it hasn't seen much competitive play
