It's very powerful in every place that you can think of to run it in, and it has two tribal synergies too, by the by
Psyduck Illustration Rare #175: ~$78 Yes, Psyduck
Preventing your opponents from splitting their forces can be quite effective, especially since so many Commander players prefer to split the love across the table
There are many options to the top with this archetype, your enemy will run out of life points long before they can close off all path to your most effective Heroes like Malicious Bane, usually leading to a field wipe and quick OTK
This card, one of the ten original "dual lands" of the game, is exceedingly powerful as well as exceedingly valuable, as Wizards of the Coast has vowed to never reprint it again
it can make a second attack during each Battle Phase this turn, also, if it attacks this turn, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step