Mareep is card #55 of 189 in Darkness Ablaze (2020), a Common illustrated by sowsow. At about $0.40 it is the #94 most valuable card in the set. In a Darkness Ablaze booster it turns up about once every 12 packs. It is one of 28 Mareep cards printed so far.
2000Neo Genesis
2003Aquapolis
2006Dragon Frontiers
2009Platinum
2011Call of Legends
2018Lost Thunder
2020Darkness Ablaze
2021Chilling Reign

















See the full Darkness Ablaze card list
An ungraded Mareep from Darkness Ablaze sells for about $0.40. A PSA 10 is worth more, roughly $1.40 by our estimate, and a PSA 9 around $0.80.
It is a Common, and it shows up about once every 12 Darkness Ablaze packs.
sowsow drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Darkness Ablaze booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.