Thassa, Deep-Dwelling Half the value of Thassa, Deep-Dwelling comes from the fact that it can blink one of your creatures every turn
Vraska The deadly and quick-witted Vraska, a gorgon from Ravnica, has held many titles and allegiances throughout her life
Even taking one of your opponent's turns more often than not is devastating
Of course, people are wanting as much of the Final Fantasy VII cards as possible, as it is one of the most popular games in the franchise (Personally, Final Fantasy IX is a much better game that many overlook these days), so pulling both Cloud and Aerith in their standard format cards from the Play Boosters was a bit of good luck
In particular, the starter decks for set 7 offer a great base to expand on because of their color combinations, which were some of the best in the game in Azurite Sea, and will likely still be great going into Archazia's Island
Sure, you'll exile this and your cards, but so will your foes, so no one can cast them later