Mareep is card #94 of 132 in Secret Wonders (2007), a Common illustrated by Atsuko Nishida. At about $5.17 it is the #69 most valuable card in the set. In a Secret Wonders booster it turns up about once every 10 packs. It is one of 28 Mareep cards printed so far.
2000Neo Genesis
2003Aquapolis
2006Dragon Frontiers
2007Secret Wonders
2009Platinum
2011Call of Legends
2018Lost Thunder
2021Chilling Reign

















See the full Secret Wonders card list
An ungraded Mareep from Secret Wonders sells for about $5.17. A PSA 10 is worth more, roughly $41.36 by our estimate, and a PSA 9 around $14.48.
It is a Common, and it shows up about once every 10 Secret Wonders packs.
Atsuko Nishida drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Secret Wonders 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.