There are so many ways for black to kill a creature that no matter what defensive powers a target might possess, black will find a way around them
Specifically, you get to conjure the Power Nine, which are: Ancestral Recall Black Lotus Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Timetwister Time Walk Even better, you can blink Oracle of the Alpha a few times to get even more copies of cards like Time Walk in your deck to start taking as many turns as you need
Soar, strike, and smash your way to victory in 4 Ready-to-Play Collector' s Edition Commander Decks
Rating: 4/5 Tigger - One of a Kind Here's another one for whenever an "actions matter" deck becomes a thing
If your life total can't change, spells and abilities that would normally cause you to gain or lose life still resolve while your life total can't change, but the life-gain or life-loss part simply has no effect