Jace Beleren

Jace Beleren is a blue Planeswalker in Magic: The Gathering. As the epitome of a blue mage, he specializes in mental magic, including mind-reading, illusion, telepathy, curiosity, deception, and of course, knowledge.

Cards
In the game, he shows up in four different forms: (Core Sets 2010 and 2011, Lorwyn, special release with the book Agents of Artifice, and Duel Deck Jace vs. Chandra) who allows his controller to draw cards and make their opponent discard cards from the deck in a process known as "decking";  (Core Sets 2012-2014), who, like Jace Beleren, provides ample resources for decking strategies;  (Worldwake, From the Vault 20), who allows his controller to draw cards, manipulate their opponent's libraries (as opposed to just sending it all to the graveyard), and ultimately exiling the opponent's library (he was also the first Planeswalker with four abilities and an ability that doesn't add or remove loyalty counters); and  (Return to Ravnica), who temporarily weakens opposing creatures and allows a player to search each library for any one card. All versions are Mythic Rare, except for Lorwyn (since there was no Mythic Rare rarity at the time).

Jace is also mentioned in a large number of other cards' flavor text, including and ; in the art of various cards, including  and ; and in the names of certain spells, including  and. The vast majority of cards that reference him are blue.

Story
Jace has traveled to various planes, including Lorwyn, Zendikar, and Ravnica. While in Ravnica (his adopted home), he helped the dragon Niv-Mizzet (leader of the Izzet League) try and solve the Implicit Maze that would give the winner nearly infinite power.