Mystical Tutor

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

Dandân

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

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.