Rummage effects like this are pretty much always useful, since they let you sculpt your hand according to the current gameplay situation
This two-mana Angel comes down quickly, which is rare among the many higher mana value creatures, and helps you cast those bigger spells, since you can tap her to add a white mana that can only be used on Angel spells
Most of the tribal cards in Cube need to be good enough on their own, like Siege-Gang Commander and Graveborn Muse, or need to make it so that using your picks on the tribe and places in your deck are worth it
FromTheShire: I fucking love this card, and not just because I'm a monster who wants to Living Land and then Elesh Norn, Grand Cenobite
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Based on the current Magic economy, I cannot name a single thing in the entire world that is as easy to counterfeit as a Magic card that would provide a higher rate of return