In that same deck slot, you could run a card like Fireball or Earthquake that is way more flexible and scales with the amount of mana you have available
People would forget which creatures were reanimated with which ability, especially when tokens, clones, or long turns entered the picture
The creatures targeted by Ravenous Gigantotherium's ability deal damage back to Ravenous Gigantotherium before dying if they're dealt lethal damage
It isn't used very often, but since I occasionally find myself troubled by monsters with effect protection, I include it just in case
Ill see you all at #SCGATL this weekend, where we will see for ourselves what the building blocks of the Amonkhet Standard format will be.
Get a Sol Ring or one of the other busted mana rocks to even the odds