Dandân

This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.

Halimar Depths

This land enters tapped.
When this land enters, look at the top three cards of your library, then put them back in any order.
{T}: Add {U}.

Narset's Reversal

Copy target instant or sorcery spell, then return it to its owner's hand. You may choose new targets for the copy.

Unsubstantiate

Return target spell or creature to its owner's hand.

Take Inventory

Draw a card, then draw cards equal to the number of cards named Take Inventory in your graveyard.

Mystical Tutor

Search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top.

Magical Hack

Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwalk" to "plainswalk." This effect lasts indefinitely.)