They not only ramp you in up to three colours, they also have the exalted keyword, making your creatures an itty bit more effective when they attack alone.
Imagine having two in play at some point
Fight Rigging is delightfully easy to turn on, so getting a free spell and +1/+1 counters every combat for three mana is how were evaluating this one
You can't put a Teferi's Moat out there for a long, long time against decks unknown with the knowledge that an enchantment removal or bounce spell will almost certainly kill you unless you are very brave, and once you start down the Moat road it's hard to stop
If you choose the rebound, your deck will not be shuffled
If youre after a Vampire Commander that blends lifegain and Voltron perfectly, shes a strong contender for the best Vampire Commander title