Wall of Denial A spectral bulwark that floats above the battlefield, untouchable by magic or steel, ensuring that nothing can pierce your defenses
Whenever one or more cards are put into exile from your library and/or your graveyard, put a +1/+1 counter on Laelia
In the late game, if youve got a board full of counters, ol Bill here can multiply em, which can close out a game quickly
With cards like Scute Swarm, Field of the Dead, and Springheart Nantuko, this gets game ending incredibly quickly, so much so that people are already brewing cEDH decks around it
So the first and more important rule is that there are no set rules on building a commander deck