1 Zombie-Type Tuner + 1 or more non-Tuner Zombie-Type monsters If this card is Special Summoned: You can banish 1 Zombie-Type monster from your Graveyard; this card gains ATK equal to the banished monster's original ATK, until the end of this turn. If this card on the field is destroyed by battle or card effect and sent to the Graveyard: You can target 1 of your banished Zombie-Type monsters with 0 DEF; return it to the Graveyard. You can only Special Summon "Shiranui Shogunsaga(s)" once per turn.
Shiranui Shogunsaga’s attack boost can be activated when Special Summoned, not just Synchro Summoned.
In a Shiranui deck, you can make Shiranui Shogunsaga by using Level Augmentation on your Shiranui Tuner to make it level-4. You can also make Shiranui Samuraisaga with Shiranui Spectralsword’s effect and Shiranui Solitaire and synchro climb into Shogunsaga from there.
Shiranui monsters activate effects when they are banished, so Shogunsaga’s effect cost can be used to activate them. Shogunsaga can return banished Shiranui monsters to the graveyard for setup.