Snapdragyn
Explorer
Not quite sure what you mean by "limit", but Circle of the Moon gets Combat Wild Shape (Wild Shape as a bonus action, expend spell slots to regain hit points), and Circle Forms (higher CR of creatures you can Wild Shape into, starts at CR 1 and goes up).
Bardic Inspiration affects one creature other than yourself and you can use it Charisma modifier times per long rest.
I know in alpha the CR for CotM wild shaping was limited to 1/3 of the druid's level (minimum 1) - which to me still seems like a scouting shape, not a battle shape. Seemed pretty weak IMO considering that you have to sacrifice spell casting AND whatever benefits Circle of the Earth would've given you instead to get that.
And Bardic Inspiration... yeah. Um. *walks back over to the Warlock play area*
Thanks for all of the answers, btw!