Arima, the Dreamblade

+1: Put a loyalty counter on Arima, the Dreamblade for each cardyou own in exile with a dream counter on it.
-4: Create a 1/1 blue and black faerie creature token with flying and deathtouch. Dream the top card of target player's library.
-10: You get an emblem with "You may cast dreamed cards in exile without paying their mana costs."