The card draw alone is enough reason to play this card, but in any control shell, you can make that second ability not even a downside and eventually win off the first ability
With Shang-Chi, you could trigger something likeKarametra's Acolyte, activate Temur Sabertooth, and create an infinite ETB loop that just keeps piling up green mana
Eldrazi Conscription If you dont have a handy Eldrazi titan to hand, you can always create your own
This often rose to the level of outright hatred, which meant that even though a lot of players didn't want to or weren't capable of piloting the Bloom deck, they still faced enough hate to keep the deck in check
If Mox Opal stays banned it is only because we have a new potent payoff in Urza's Saga, a card I hope to feature in an upcoming article.
Just look at Fatal Push