Mareep is card #73 of 123 in HeartGold & SoulSilver (2010), a Common illustrated by Masakazu Fukuda. At about $13.09 it is the #73 most valuable card in the set. In a HeartGold & SoulSilver booster it turns up about once every 7 packs. It is one of 28 Mareep cards printed so far.
2000Neo Genesis
2003Aquapolis
2006Dragon Frontiers
2009Platinum
2010HeartGold & SoulSilver
2011Call of Legends
2018Lost Thunder
2021Chilling Reign

















See the full HeartGold & SoulSilver card list
An ungraded Mareep from HeartGold & SoulSilver sells for about $13.09. A PSA 10 is worth more, roughly $105 by our estimate, and a PSA 9 around $36.65.
It is a Common, and it shows up about once every 7 HeartGold & SoulSilver packs.
Masakazu Fukuda drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open HeartGold & SoulSilver 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.