There is nothing more convenient for an Oni Assassin than a body that can repeatedly cast witchcraft.
Ability / Effect
[Call Cost] [Pay 1 gauge] When this card enters the field, put up to one card with [Ambush] that is not "Red Lady Oni, Kureha" from your drop zone into your hand. Then, if this card enters the field by [Ambush], you may put a card from your hand face down into the soul of an 《Oni Assassin》 on your field. [Ambush][Move]