This is a trend that started in the sports card world, but has carried over to other collectible card markets such as Magic and Pokemon in recent years
Chrome Mox Zuran Orb Brainstorm Sensei's Divining Top Mystical Tutor Spell Pierce Swords to Plowshares Fire/Ice Lightening Helix Snapcaster Mage Balance Isochron Scepter Remand Arcane Denial Lat-Nam's Legacy Disenchant Trinket Mage Timetwister Jace, the Mind Sculptor Elspeth, Knight Errant Gideon Jura Temporal Mastery Terminus Bonfire of the Damned 16 Lands (I cannot be bothered to work out a sensible mana base for a deck I'm not going to battle with, sorry
The fact that he is a sacrifice outlet may prove important as well
The art box, borders, and text box
This will have 1 or more colors, which determine the cards available to use when building a deck
[22] Rather than take their form based on their holder's Deck, they take a form relative to the legend that is described