Cards that retarget things might not always be what you need at the moment, but when they are, they tend to create epic moments
By turn five, you can expect to be cheating out huge mana-value creatures, like Demon of Death's Gate or Pestilence Demon
(It cant be blocked except by artifact creatures and/or black creatures.) When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature
Things like Satyr Wayfinder and Coiling Oracle are all about the EtB effect
Every single deck you ever play against will immediately try and take out your eldrazi, and without spellskite your chances will drop tremendously
If you want to know which is better, check out my rankings of the swords