Because the creature always refunds you the card no matter how it dies, your opponent is heavily disincentivized to trade with anything blitzing at them
For example, Strip Mine and Wasteland can sacrifice themselves to take other problematic lands off the table
An artifact's mana value is determined solely by the mana symbols printed in its upper right corner (unless that artifact is the back face of a double-faced card, is a melded permanent, or is copying something else
#14 It seems related but this frequently seems to cause the client to become unresponsive during sideboarding
Stealthy Hood This is a card that some people believe just counters Shock Lock, but its really nothing too bad to deal with
Considering the fact that most decks running Hazoret already have shockingly cheap spells and creatures, this was often just a cute bonus