This is one of those puzzles that has a clear and definite solution. I like varying what I highlight in this column, and since Storm is the best combo deck in the format (and potentially just the best deck overall), this felt like a fun one.
It’s the start of your main phase, and you have zero cards in your graveyard. Your opponent has no mana untapped, so they are shut down completely by the Defense Grid. They are at 20 life.
Deck List: Vintage TPS
You sideboarded as so:
Here’s my play (bonus points if you do it very quickly and with confident motions):
Play Dark Ritual, and cast Yawgmoth’s Will.
Play Black Lotus, Lotus Petal, and sacrifice both to cast Dark Petition (now with spell mastery thanks to Dark Ritual + Petition). Get Tendrils of Agony.
Mana: BBB (from Petition)
Cast Dark Ritual and Tendrils of Agony for more than lethal.