Split damage burn is a little more valuable in Izzet tempo than most other lists
You spend your picks on bombs, removal, card advantage, and mana fixing and simply overpower opponents when the games go long
Given that Goblins usually run in packs, youll often find yourself rapidly blasting past twenty Goblins with very little effort, so if you build your deck intelligently, you can flood the entire board in an instant, and nobody can stop you
Then as long as you have 30 or more life, the dork gets indestructible to remove much removal interaction, only exiling mass removal or targeted non-destruction removal can get past this, and then it's +5/+5 size and then all damage to it is prevented
It's a very strong and useful anti-creature tool that will shut stuff down in a very useful way
Vega, the Watcher Vega, the Watcher gets better the more ways you have to cast spells from exile, and with mechanics like foretell and plot and the revival of suspend in Commander, its becoming easier than ever