While your opponent controls a Special Summoned monster and you control a Level 7 or higher War Rock monster, during Main Phase 1, neither player can activate the effects of monsters on the field. During your Main Phase: You can Set 1 War Rock Spell Trap directly from your Deck, except War Rock Medium , also you cannot Special Summon monsters for the rest of this turn, except Warrior monsters. You can only use this effect of War Rock Medium once per turn.