Travis King has a great video on the topic over on Youtube
People play all sorts of Haste-enablers in Commander, why Urabrask is rarely one of them is beyond my understanding
When its defeated, exile it, then cast it transformed.) When Invasion of Regatha enters the battlefield, it deals 4 damage to another target battle or opponent and 1 damage to up to one target creature
With Hydra Omnivore, you can send attack any opponent where it will definitely get through (someone with no blockers, for example) and every opponent takes the hit
Explosive Fire hits for 130 damage, and it does an extra 100 damage if Charizard VSTAR has any damage counters on it
If you're lucky enough to open him, hes a powerful addition that enhances both your artifact synergies and control plan