Invasion of Zendikar | Illustration by Diego Gisbert Chief of the Wilds seems like a fun commander for a green black wolves deck, but then you read its second line of text and spot something
Fishing Gear Whenever equipped creature deals combat damage to a player, exile the top card of that player's library

Here they are: Dual Lands Underground Sea: Grixis Control, U/B Deaths Shadow, Grixis Delver, Ad Nauseam Tendrils, Esper Stoneblade Volcanic Island: Grixis Control, Sneak and Show, Grixis Delver, Temur Delver, Ad Nauseam Tendrils Bayou: B/R Reanimator, Ad Nauseam Tendrils, Four-Color Loam, Turbo Depths Badlands: Grixis Control, B/R Reanimator, Four-Color Loam Tropical Island: Temur Delver, Infect Tundra: Miracles, U/W Stoneblade Scrubland: Four-Color Loam, Esper Stoneblade Savannah: Four-Color Loam Taiga: Lands, Four-Color Loam Other Cards City of Traitors: Sneak and Show, Eldrazi Stompy, Affinity, Mono-Red Prison The Tabernacle at Pendrell Vale: Lands, Four-Color Loam Intuition: Sneak and Show Null Rod: Miracles, Grixis Delver Lions Eye Diamond: Ad Nauseam Tendrils Mox Diamond: Lands, Four-Color Loam Drop of Honey: Lands Grim Monolith: Eldrazi Post Gilded Drake: Merfolk This list is eighteen cards long

Obviously, you cannot tell by looking at them from the outside, as their content is supposed to be a surprise for the collector who opens the pack
That creature is a Vampire in addition to its other types