Choose your colors (or colortheres nothing wrong with playing a monocolor deck!), then select a good all-around commander that matches those colors
Weaknesses: 2 | Resistance: - | Retreat: 6
For example, take the Magic booster
Each booster contains 10 Magic: The Gathering cards and 1 Traditional Foil double-sided token, with a combination of 45 cards of rarity Rare or higher, 5 Uncommon cards, and 01 Land cards
Reach creatures are also prominent in Green, and are frequently printed with Deathtouch as well, meaning even a single point of damage will knock your flier out of the sky, no questions asked
And then you destroy all non-Phyrexian creatures, before (as if that wasn't enough) Elesh Norn gets to come back as a creature again, so you can do it all over