Most opponents will be reaching for every tool at hand to demonstrate their displeasure for effectively resetting the game especially if you cant follow up your board nuke with an efficient way to win
Will, Scion of Peace doesn't contribute to this directly, but lifegain comes in large chunks, which converts to a sizeable portion of mana you don't have to spend on something like Sphinx's Revelation
It's true utility is its cute factor: what cold-hearted monster would kill a Pup
(2018-10-05) You perform the actions stated on a card in sequence
Whenever one or more creature tokens you control deal combat damage to a player, exile target instant or sorcery card with mana value equal to the damage dealt from their graveyard
This card has you mill three cards, then forces all of your opponents (since this is the Commander format, there is usually more than one) to choose one creature from your Graveyard