mtg duskmourn most expensive cards target attacking creature gets +1/+0 and gains first strike until end of turn. The Mana Math of Duskmourn:

wipes with options that mitigate these downsides are powerful

That said, this remains a powerful sideboard piece against decks like Amulet Titan

Seedborn Muse Seedborn Muse is pushing up against the $20 limit, but this unparalleled untap value engine ensures you always have blockers and mana on opponents turns

Legendary Planeswalker - Ajani Nikara, Lair Scavenger Partner with Yannik, Scavenging Sentinel (When this creature enters, target player may put Yannik into their hand from their library, then shuffle.) Menace Whenever another creature you control leaves the battlefield, if it had one or more counters on it, you draw a card and you lose 1 life