They protect my aggro threats from commonly played removal and threaten to bury opponents in card advantage and value while making your attacks better
Its big enough that it can fit across a table, and both players can lean over it as they plot their victory
To get started, you need Phyrexian Altar on the battlefield, Reveillark in your hand, and Karmic Guide in your graveyard (which is easy enough to do with its Evoke ability)
Titan of Littjara becomes the chosen type in addition to its existing types
The fixing aspect helps enable multicolor lists, which human decks often leverage well
But, it is a Wolf, which could be relevant when Innistrad arrives in a couple months, and the enchantment does so much else that you can afford a less exciting creature