We don't get any details, which almost makes it worse
The cards inside are most likely going to be unlimited, but in the event of a 104-04 postcode box with the 1st edition rulebook, you have a very slight chance of pulling no rarity cards
Only time will tell, but I struggle to believe this is anything less than one of the strongest Izzet commanders ever printed
He has a lot of unique directions and possibilities to build around
The other option is to take advantage of the direct damage, which is good in its own right to either finish off a damaged character or get them within range to be banished but also works with the likes of cards that benefit from being damaged - such as Scroop, Backstabber - that benefit from healing damage, like Rapunzel, Gifted Artist, or from damage being dealt: like Beast, Relentless.
Upgrade 3 We arent playing Heliod, the Radiant Dawn, for the front side