Its the new normal for the game, having diverse characters as the norm, rather than isolated inclusion
Adeliz's ability triggers every time you cast an instant or sorcery, which is going to be every turn, multiple times a turn in any good spell-slinging Izzet deck
4 Caesar, Legion's Emperor Versatility In The Command Zone Since you have so many Rabbits running around, you wont mind losing a few of them for a very strong trigger
White decks urgently need card draw, which Sram provides in a build like this
Breach is one of the best enchantments MTG players can use, especially with its ability to score deterministic wins straight from the graveyard
The deck matches up well against aggressive deckscheap blockers that augment your Mill plan are exactly what the deck needs to survive until your haymakers come online