The last support card for Shiranui (in a way) is revealed from the Deck Experience event.
SAST-JP075 逢魔ノ刻 Ouma no Toki (Omanotoki / Witching Hour)
Normal Trap Card
(1) Target 1 monster in the GY that cannot be Normal Summoned/Set; Special Summon that monster.
The name 逢魔ノ刻 basically refers to the point of day in Japanese folklore where the veil between reality becomes weakest, specifically at Dusk/Sunset. For most westerners, the term “Witching Hour”, which while at 3 to 4 AM, has a similar connotation of when the powers of Black Magic, Demons and the Unearthly can seep into the mortal realm due to the lack of prayer at that time of day.