Grand Arbiter Augustin IV

White spells you cast cost {1} less to cast.
Blue spells you cast cost {1} less to cast.
Spells your opponents cast cost {1} more to cast.

Thalia, Guardian of Thraben

First strike
Noncreature spells cost {1} more to cast.

Flash
Flying
If an opponent would search a library, that player searches the top four cards of that library instead.

During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments.