Acer Shief

You can Set this card from your hand to your Spell & Trap Zone as a Quick-Play Spell. If your opponent declares a direct attack or an attack on an "Acer" monster you control: You can Special Summon this card from your Spell & Trap Zone, and if you do, negate the attack. If you place an "Acer" Soul Monster from your hand to your Soul Zone: You can add 1 "Acer" monster from your Deck to your hand, except "Acer Shief". You can only use this effect of "Acer Shief" once per turn.