If this card is sent from the hand or field to the Graveyard: You can add 1 "Frightfur" card from your Deck to your hand
The deck takes advantage of this through cards like Return of the WildspeakerReturn of the Wildspeaker, Garruks UprisingGarruks Uprising, Ugins InsightUgins Insight, and Rishkars ExpertiseRishkars Expertise
At the end of your first turn, you want to have Sky Striker Ace Shizuku on the field with 4 or 5 Set cards, which can be any combination of Sky Striker Mecha Widow Anchors , Sky Striker Mecha Shark Cannons , or Sky Striker Mecha - Eagle Boosters
Igusa and Hashinoshima: The player faces both of them at once in a 2-on-1 Duel
The latter is the more common
If Sanctum of Calm Waters leaves the battlefield while its ability is on the stack, you may control no Shrines as the ability resolves