Prowess with haste is awfully good, and just when you run out of gas, you can drop this and flip it for a total of 4 mana in the right deck, and draw three cards
An Ur-Dragon deck is often going to be "public enemy" right away , so your opponents will likely target you due to how many players know how much the deck can snowball if left unchecked
If the token isn't a creature as it enters the battlefield, it won't be attacking
Little creatures can be pretty scary if getting into a fight kills the other creature, no matter how big it is
In standard it was the core to the aptly named Puresteel Paladin deck, using its main ability to draw into more action and later on the metalcraft ability to cheat out on some equip costs, but it has also seen play in Cheerios, a deck based around 0 mana artifacts and Paradoxical Outcome to eventually cast Grapeshot, and most recently in Hammer Time, which focuses on Colossus Hammer, where Puresteel Paladin once again comes in to both help circumvent equip costs
