If the returned creature can't attack for any reason (such as being tapped or having come under your control that turn), then it doesn't attack
Many cards, when built around, can create some absolutely disgusting value, but many of the cards here either fit into established themes or need a lot of support to shine
For example, you can open an extended-art surge foil version of The One Ring
Because Breena is so efficient at loading up on +1/+1 counters I've leaned into it with a strong counter subtheme: we use those counters to draw cards off Dusk Legion Duelist, ramp with Scholar of New Horizons, have board wipe insurance with Felisa, Fang of Silverquill, and turn our team into lethal angels with Sigarda's Summons
Theres a lot of free equipping going on (more on that later) and so I want to get a built-in creature to go with it
Mystery Booster 2 is also the first set to bring digital-only mechanics, like Ruskos conjure ability, to physical Magic