Which could then trigger the first effect of Oracle
Life is used as a resource constantly in Commander, from fetchlands to removal, from mana generation to card draw
But it's at least worth considering that you could be buying proxies if you are using the cards in a casual environment (READ: NOT A TOURNAMENT), are not trying to pass them off as real, and your friends are OK with it
Now if the player wants to protect each creature, they can pay the Overload cost of four generic and one colorless mana
Dont get me wrong, its absolutely worth two mana to get back a creature in most situations, but cheap is not free, and we might want to keep our average mana value down so we can afford to use Terra while playing other cards
Nistro was saved by Yuma and the effect of his "Achacha Chanbara"