Sphere of Safety Attacks become nearly impossible without huge amounts of mana once Sphere of Safety is on the field
With this you don't have to, it is not at all dead in the matchups where you don't care about life and it is typically your best card in the ones you do
Curses generally fit a type of control build anyway so a control commander in the colors of the curses you want is probably the right choice, at least until The Unluckiest gets printed and we live the dream
Whats interesting about Collector Boosters is that they dont contain cards that are intended to be played with at all
Whenever another creature enters, you choose one of three modes, put a +1/+1 counter on the Greeters, create a tapped Treasure token, or gain 2 life
How you choose to get to that combo (and how quickly, with how much protection) is up to you