Karn is an unusual Planeswalker, to say the least. He has many significant weaknesses, but powerful and/or unique abilities, some of which work to turn his weaknesses into strengths, and all extremely useful. Being colorless, Karn can generally include [[card]]s of any [[color]] in his [[deck]]s, as long as they share a color with the [[event]] node on which he plays. He has high health and below average deck limits. His mana bonuses are perfectly balanced, but in total, as low as [[Origins]] Planeswalkers. All of his abilities are quite inexpensive; his first is tied for second cheapest, and the second and third are the cost of many Planeswalkers' first and second abilities. The other two abilities that cost 4 Loyalty are the first abilities of [[Daxos the Returned]] and [[Jace, Mirror Mage]].

Being colorlessLike [[Sarkhan Unbroken]], Karn he can generally include cards also receive a boost to bis bonuses of the colors of any color in his decksa card, but he {{Ability|Fetch|Fetches}} the card rather than draws, as long as they share and the bonus is permanent. His ultimate (ult) creates a color strong golem {{Ability|Token}} that can gain {{Ability|Prevent Damage}} while 3 supports are controlled. His abilities have a minor {{Ability|Exile}} theme, including returning cards from exile to hand with a small mana boost, and {{Ability|fetch|fetching}} a card from the event node on which he playslibrary and exiling others.

He has high health and below average deck limits. His mana bonuses are perfectly balanced, but in total, as low as [[Origins]] Planeswalkers. His abilities are, added together, the cheapest in the game: his first is tied for cheapest, and the second and third are the cost of many Planeswalkers' first and second abilities.  His abilities can also permanently increase his mana bonuses, as well as create a strong golem {{Ability|Token}} whose powers depend on how many Supports you control. His abilities have a minor {{Ability|Exile}} theme, including returning cards from exile to hand with a small mana boost, and {{Ability|fetch|fetching}} a card from the library and exiling others. Karn, Scion of Urza is the first of two a small number of playable Planeswalkers in MtGPQ which embody Karn at different points in his life.

| Effect 2 = Pick one of the next <b>3 </b> cards of your library. {{Ability|fetch|Fetch}} that card and Exile the others. If it was a colorless card, your mana bonuses are increased by 1. Each mana bonus can't be raised by this ability more than 3 times.

| Effect 3 = Pick one of the next 3 cards of your library. {{Ability|fetch|Fetch}} that card and Exile the others. If it was a colorless card, your mana bonuses are increased by 1. <b>If not, your mana bonus in that card's color is increased by 1. </b> Each mana bonus can't be raised by this ability more than 3 times.

| Effect 4 = Pick one of the next 3 cards of your library. {{Ability|fetch|Fetch}} that card and Exile the others. If it was a colorless card, your mana bonuses are increased by 1. If not, your mana bonus in that card's color is increased by <b>2</b>. Each mana bonus can't be raised by this ability more than 3 times.

| Effect 2 = Pick one of the first <b>3 </b> cards from your Exile. It gains <b>6 </b> mana.

| Effect 3 = Pick one of the first <b>2 different cards </b> from your Exile. It gains They gain 6 mana.

| Effect 4 = Pick one of the first <b>3 </b> different cards from your Exile. It gains They gain 6 mana.

| Effect 2 = Create a <b>Karn's Construct {{Ability|Token}} </b> [8/8 with "While you control 3 or more supports this creature gains {{Ability|Prevent Damage}}. '''At the end of your turn, if you control 2 or more supports, return the first support from your graveyard to your hand and it gains 6 mana.'''"].

| Effect 3 = Create a an <b>Improved Karn's Improved Construct {{Ability|Token}} </b> [12/12 with "While you control 3 or more supports this creature gains {{Ability|Prevent Damage}}. At the end of your turn, if you control 2 or more supports, return the first support from your graveyard to your hand and it gains '''8 ''' mana."].

| Effect 4 = Create a an <b>Improved Major Karn's Construct {{Ability|Token}} </b> [12/12 with "While you control 3 or more supports, this creature gains {{Ability|Prevent Damage}}. At the end of your turn, if you control 2 or more supports, a support you control gains 2 shield, then return the first support from your graveyard to your hand and it gains '''10 ''' mana."] on the battlefield.

<blockquote>''The Planeswalker Venser sacrificed himself to free Karn’s mind and body, but Mirrodin, a plane Karn himself had created, was lost. Grief-stricken by the fate of his world and the death of his friend, Karn travels the Multiverse, retracing his steps to ensure the Phyrexian contagion has not taken hold elsewhere. Karn is constantly searching for more weapons he can deploy against the Phyrexians—which has brought him back once again to [[Dominaria]].''</blockquote:>> [[Karn, Reflective Silver#Story|Karn, Reflective Silver's Story]]