When Flooded Sanctuary enters the battlefield, look at the top five cards of your library. Put one of them into your hand and the rest into your graveyard.

Adamant — Whenever you cast a spell, if at least three blue mana was spent to cast that spell, you may sacrifice Flooded Sanctuary. When you do, create a Mystic Sanctuary token. (It’s a Island land with “Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands" and "When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your graveyard on top of your library.")

Whenever you attack, you may collect evidence 2.

Whenever you exile one or more land cards from your graveyard to collect evidence, investigate. If three or more land cards were exiled, untap a land you control. If six or more land cards were exiled, surveil 3, then draw two cards.