Sometimes there are additional effects
It redirects any damage it takes to another target and prevents players it damages from gaining life for the rest of the game, making it a perfect finisher for decks like Mono-Red Aggro
Gifting a card is a big cost, but when you consider that you might destroy a Banishing Light or an Innkeeper's Talent in exchange, it definitely looks like a nice option to have
Its a bit costly at 3 mana a rotation and requires something else to sacrifice, so it might not be ideal for every deck
Sure it enters tapped, but unlike a lot of utility lands we see, this one can produce colored mana so it isnt a liability for your mana base
The problem is that this has diminishing returns as the game goes on, especially because it has to attack to give you that discount