The main reason I used to use Transcendence over Arbiter was the 50% vs. 100% SC cost. Now that they're equal, it's a no-brainer. Arbiter gives unlimited power for 30 seconds (and its own loadout). Best wipe-saving supercharge in the game. Pop your trinket, then cast Arbiter. Drop a COP, then alternately spam Final Ruin and Rejuvinate. End with another COP. With good timing, you will come out of it with full power for yourself (thus more power for your teammates), your whole team at full health, a fresh COP, and about 20-25,000 Damage from Final Ruin spamming. Lovin' the Arbiter.