mtg descend cards upon the Sinful | Commander 2020 put two descent counters on Descent into Avernus Descent, 15 cards | Magic:

III Put an indestructible counter on up to one target Human

This card is very impressive, and is sure to show up across from you at Commander tables

I still needed ways to produce card advantage in this matchup because he had planeswalkers of his own and most likely a Treasure Map in his deck somewhere since it plays so well with Karn, Scion of Urza

An important thing to keep in mind with Spellseeker is that it is an enter-the-battlefield trigger, so if you have a way to blink it or return it to your hand to cast it again, you can get more than just one spell

Leonin Relic-Warder Leonin Relic-Warder interacts with nonsense like Rhystic Study and Smothering Tithe, but its most notable for its ability to create an infinite loop with Animate Dead or Dance of the Dead

Not the biggest trade, but if he's taken a few folks out with him, he's got you closer to or further into the lead, doing more than some other cards would in just a couple of rounds