Take the Promising Stairs, and while the other side helps you tutor for rooms, the right side can win you the game with just four split cards
And then F (or Z tbh) for junk slabs
Smothering Tithe is a Treasure generator like no other, generating more mana in a Commander game than almost anything else
If you're still drafting Bloomburrow at your LGS and you're about to crack open that next play booster, which single card would be the best to open from a value standpoint (according to TCGplayer's market price)
For creature matchups, we have a motley crew of blue cards, with So Tiny being our Sword to Plowshares, Warrant // Warden often permanently answering a creature since we can put it on top of our opponent's deck and then mill it away, Run Away Together offering some fun tricks where we can bounce our opponent's best thing and one of our enters-the-battlefield mill creatures, and Flood of Tears being our (very bad) Wrath of God
Per 702.90b, the infect damage dealt does not result in a loss of life, instead that player is given that many poison counters