Witchcrafter Walpurgis

During your Main Phase: You can add 1 "Witchcrafter" monster from your Deck to your hand, then discard 1 card. You can only use this effect of "Witchcrafter Walpurgis" once per turn. During your turn, if a "Witchcrafter" monster you control would discard to activate an effect, you can send 1 "Witchcrafter" Spell/Trap from your Deck to the GY instead, except "Witchcrafter Walpurgis".