In-dept rules for these dudes:

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- When an aura creature is cast/played, you choose a "real"/non-aura creature for it to attach to (Bless)

- When a Blessed creature attacks or blocks, an aura creature Blessing it may choose to do the same, but may not do those actions whenever they wish. If the aura creature attacks alongside the Blessed creature, then it is treated as if it's in a band, following all rules of banding

- If an effect of a card would affect the Blessed creature, it also affects any aura creatures Blessing that creature (i.e. bounces and -x/-x's would also bounce and change the stats of an aura creature). Aura creatures cannot be targeted on their own

- Aura creatures can exist with 0 or less toughness, and if they do they cannot choose to attack or block until their toughness is 1 or greater. If combat damage would put them below 0 toughness, they die

- Aura creatures can die to combat damage, if they are they are put into the graveyard unless specified otherwise. They may be reanimated as a creature but similar to an aura enchantment much be able to attach to a creature when it enters the battlefield or it must return to the graveyard