For Cubes, which are designer formats with unique metagames and a lack of reliable statistics, defining power level is nontrivial
Loxi: This is a great example of a charm - flexible, but always useful enough that it won't ever feel like it's completely dead, and has even more flexibility due to it's X cost
Its like a preemptive reanimation
As long as it hasn't previously been opened and you don't know the contents beforehand, you're good
Tinybones, the skeletal rogue introduced in Outlaws of Thunder Junction , has become Titanbones, a giant druid who protects the creatures of Yavimaya
It wanders the university in a huff, constantly reading its own text aloud