Wildcards were created to mimic the tabletop version of trading
When you do, put a +1/+1 counter on target attacking creature

As it stands, the prices are as follows: Secret Lair x Monster Hunter: The Hunt Blind Obedience - around $3 Snap - around $2.50 Village Rites - around $0.25 Mizzium Mortars - around $0.45 Tooth and Nail - around $2 Total value: $8.20 Secret Lair x Monster Hunter: The Hunters Grand Abolisher - around $10 Archaeomancer - around $0.20 Grim Haruspex - around $1.30 Imperial Recruiter - around $12 Champion of Lambholt - around $2 Total value: $25.50 Secret Lair x Monster Hunter: The Monsters Nezahal, Primal Tide - around $8 Sarulf, Realm Eater - around $0.35 Vaevictis Asmadi, the Dire - around $1 Ziatora, the Incinerator - around $0.30 Drakuseth, Maw of Flames - around $0.50 Total value: $10.15 Secret Lair x Monster Hunter: The Monsters 2 Wasitora, Nekorus Queen - around $0.50 Kalamax, the Stormsire - around $0.40 Amareth, the Lustrous - around $0.25 Razaketh, the Foulblooded - around $8 Total value: $9.15 Sol Ring is generally inexpensive on its own (at about $1.20), and while it's a collector's item when it comes out in different, special versions, this doesn't really increase the value of the superdrops

The somewhat secret ability that I believe is the most powerful is the +1, which most likely takes the last remaining cards from your opponents hand
If you want the regular printing, it's one of the cheaper values, but the Extended Art version is worth a fair bit more if you're looking to bling your deck out more