All somewhat minor when looking at the mana gain but still well worth considering when trying to evaluate and compare
Howl to your kin, and be ready, for the season of the wolf is still far from over
When it dies, it tucks itself third from the top of your library so you can cast it again later
Urborg, Tomb of Yawgmoth is a land that does just one thing, turn all lands into play into Swamps, including itself
Once you've generated an Army for free from your opponent's spells, attack with it, and you'll get to engage with the Ring - and if that wasn't enough, you can even discard your hand and get four fresh cards
You cant have your cake and eat it too - but you can steal your friends cake and eat it all