This lead to all sorts of tech cards being introduced into other decks
Suppose you play against a deck like Daretti, Scrap Savant that can assemble combos like: cheat Darksteel Forge and Mycosynth Lattice into play, and follow that up with mass artifact destruction
Odd-Eyes Persona Dragon X DARK Level 5 [ Dragon / PendulumEffect ] ATK 1200 DEF 2400 P Scale 1 Once per turn, during the End Phase, if your opponent activated a card or effect this turn that targeted 1 "Odd-Eyes" Pendulum Monster you controlled (and no other cards) while this card was in your Pendulum Zone: Special Summon this card, and if you do, place 1 face-up "Odd-Eyes" Pendulum Monster from your Extra Deck in your Pendulum Zone, except "Odd-Eyes Persona Dragon"
All affected players should first make the choices, and only then the effects happen all choices first, then all effects simultaneously. And you wouldn't be too wrong for thinking that
You want the Jesper Ejsing version of this classic removal spell to be on theme
You can only use this effect of "Circle of the Fairies" once per turn