It is a Psychic card illustrated by Amelicart
This often coincides with the power of "Heart of the Cards" moments to make for some of the cheesiest wins by pulling the exact card they need to win a duel
The cost is indicated by a symbol (or symbols) corresponding to one of the primary types of Energy card

1 Urabrask, the Hidden 1 Phyrexian Juggernaut 1 Ruby Medallion 1 Bludgeon Brawl 1 Red Sun's Zenith 1 Iron Myr 1 Grafted Exoskeleton 1 Lightning Greaves 1 Golem-Skin Gauntlets 1 Palladium Myr 1 Mind Stone 1 Skullclamp 1 Sol Ring 1 Darksteel Plate 1 Sword of Fire and Ice 1 Chancellor of the Forge 1 Detonate 1 Furnace Dragon 1 Molten Psyche 1 Hoard-Smelter Dragon 1 Trash for Treasure 1 Ogre Geargrabber 1 Savage Beating 1 Furnace Celebration 1 Hellkite Igniter 1 Moltensteel Dragon 1 Kuldotha Phoenix 1 Barbed Battlegear 1 Kuldotha Ringleader 1 Magma Giant 1 Into the Core 1 Vulshok Battlemaster 1 Invader Parasite 1 Banshee's Blade 1 Priest of Urabrask 1 Shrine of Burning Rage 1 Darksteel Colossus 1 Bosh, Iron Golem 1 Mox Opal 1 Sundering Titan 1 Covetous Dragon 1 Steel Hellkite 1 Spine of Ish Sah 1 Worldslayer 1 Gauntlet of Power 1 Goblin Welder 1 Junk Diver 1 Soul of New Phyrexia 1 Bogardan Hellkite 1 Wurmcoil Engine 1 Kuldotha Forgemaster 1 Blightsteel Colossus 1 Furnace of Rath 1 Thran Temporal Gateway 1 Thran Dynamo 1 Mind's Eye 1 Loxodon Warhammer 1 Darksteel Ingot 1 Voltaic Key 1 Insurrection 1 Cathodion 1 Worn Powerstone 1 Platinum Emperion 1 Darksteel Forge 1 Urza's Mine 1 Ancient Tomb 1 Phyrexia's Core 1 Darksteel Citadel 1 Urza's Power Plant 26 Mountain 1 Urza's Tower 1 Great Furnace 1 Smoldering Crater 1 Forgotten Cave Urabrask wants to be on the field as quickly as possible and turning creatures sideways

These are clearly meant for folks who want the serialized cards as the Commanders for their decks, and I suspect the first couple of these will sell for very high prices, but it should trickle down to something more reasonable over time
For example, your red-green deck will be the epitome of red-green and prime you for future Magic releases