In the context of Modern, the card is great against Hammer Time and Affinity, while also being a flexible answer to cards like Blood Moon
I regularly use this along with Ghost Quarter to emulate a Wasteland effect, and have managed to steal a lot of games when my opponents couldn't answer it
Just remember that means you are committing to casting that Phyrexian Missionary for 2 mana if you dont have anything else on turn 2 as a 2/3 lifelink is a pretty decent creature
Banding allows any creature with banding, and at most one creature without, to attack in a band. The band can be blocked by any creature that could block a single creature in the band
Then you draw a card when it ETbs, so even if answered immediately, you'll not be down a card
Whenever a land enters under your control, you add one mana of any color