Fiend monsters in the Extra Monster Zone(s) gain 1000 ATK. You can activate 1 of these effects;
? Banish 1 Fiend monster or 1 "Archfiend" card from your hand or GY; add 1 "Archfiend" card from your Deck to your hand, except a Field Spell.
? Add 1 "Archfiend" Pendulum Monster from your Deck to your face-up Extra Deck.
You can only use this effect of "Archfiend Strategy" once per turn.