Dualcast, Anihilation, Triple, combining fire & ice.
First of all, these sounds like BLM skills.

In past few comments everyone mention a lot of fantastical damage dealing abilites they would love to see in RDM repertuar. And i didnt find single cooldown idea. You guys want faster tank queues as RDM, or to actually be a tank as RDM?
Because creating tanking class starts from concept. Your concept posses only damage dealing aspects. DRK is getting shadowskin on 2 level.
Have you ever wondered why SE made shadowskin on level 2 despite the fact earliest synchronized thing starts at level 10 (1st guildhest)? I bet you didn't. I will tell you. Sit down. It's story time.

Each level of tank role is supposed to be playable, on level 2 you must be able to win against Test_Dummy(lvl.2) which has statistics same for all classes. Becuase of different statistics for tank role, you should be able to win with more HP left than dps but after longer time.

First go cooldown's. They are tanks.