A single trigger of annihilator 4 would severely hamper the opponents resources more so than exiling the top twenty cards does
Last years Commander product included a deck built heavily around enchantments, and it was awesome to be able to add Hall of Heliods Generosity to the deck
Youre basically putting a character in a whole new story every time you draw a new card
In other formats that makes a difference, but as youre only allowed to run one of each card in Commander anyway, it allows you to run two one-mana tutors in a single deck
In fact, Ive lost quite a few matches to the Mono-Red deck already, and I dont know if the matchup is particularly close
Dealing 3 damage to each opponent might not seem like a lot in a 40-life format like Commander but, considering the amount of times we'll be able to reset this ability, that's undoubtedly going to add up