mtg swarmlord commander deck Let's Build a +1/+1 Counters Themed led by The The Swarmlord Deck for Magic:

There are several other cards that might jump out to other D&D fans with such as Lollth, Spider Queen and Tiamat which I expect most to be going for

Flying Watermark: Conspiracy Seal Illustrated by Tomasz Jedruszek Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp

ID: 115386 (TCG-MTG-SCDDD) Tap or click above to open expanded view Sealed, unopened product

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But it also can be used to discard a card from your hand to draw a card, and then play the discarded card

That seems like a steal for just a single white mana