A creature card has two numbers separated by a slash printed in its lower right corner. The first number is its power (the amount of damage it deals in combat); the second is its toughness (the amount of damage needed to destroy it). For example, 2/3 means the object has power 2 and toughness 3. Power and toughness can be modified or set to particular values by effects.
June 17, 2011 · Commander 2011
Each planeswalker card has a loyalty number printed in its lower right corner. This indicates its
April 1, 2011 · Duel Decks: Knights vs. Dragons
Each planeswalker card has a loyalty number printed in its lower right corner. This indicates its loyalty while it's not on the battlefield, and it also indicates that the planeswalker enters the battlefield with that many loyalty counters on it.
February 4, 2011 · Mirrodin Besieged
Each planeswalker card has a loyalty number printed in its lower right corner. This indicates its loyalty while it’s not on the battlefield, and it also indicates that the planeswalker enters the battlefield with that many loyalty counters on it.
October 1, 2010 · Scars of Mirrodin
Each planeswalker card has a loyalty number printed in its lower right corner. This indicates its
February 1, 2010 · Worldwake
Each planeswalker card has a loyalty number printed in its lower right corner. This indicates its loyalty while it's not on the battlefield, and it also indicates that the planeswalker enters the battlefield with that many loyalty counters on it.