If that creature's power is 2 or less when it enters the battlefield but becomes greater than 2 after the ability triggers, the target creature will still get +1/+1 until end of turn
In the dedicated library destruction deck, it makes the maindeck
Besides its obvious implications in Mardu EDH decks already built around attack triggers, in formats like Standard you can benefit from multiples of these
Azusa requires little introduction if youre coming from Modern, Commander, or even recent Standard
The ability to exile specific cards is always useful, and this engine becomes more dangerous the more you use it
On the other hand, its nice that cards that care about outlaws can go into a rogue deck, or a pirate deck, or an assassin deck, so theyre hybrid typal decks