Dragon instant CC. Most upped dragons can stand 2 shots of CC. Compare EE or Lightning.
6|4
+ 2
+ 2 turn + 1 card for instant anti-dragon.
Compared to...
5
+ 1
+ 1
+ 3 turns + 1 card for 6 damage
2|1
+ 2|1
+ ~1 turn + 2 card for 10 damage
Seems relatively balanced in terms of antiDragon in terms of quanta. It's slightly stronger compared against EE|OE, which is dragon dependent, and is relatively on par with double Lightning, which wipes out most dragons except for a handful.