Loyalty counter

Loyalty counters are counters that are used to track the loyalty of planeswalkers. Loyalty counters are exclusively connected to planeswalker cards and are usually added or removed to activate loyalty abilities.

Damage dealt to a planeswalker causes that many loyalty counters to be removed from it.

Non-planeswalker cards that interact with loyalty counters

 * Carth the Lion : While templated as a cost increase, the functional effect is that the planeswalkers now add a (or another) loyalty counter with each activation.
 * Clockspinning
 * Confront the Past
 * Dark Intimations
 * The Elderspell
 * Elspeth Conquers Death. can put a loyalty counter to both planeswalkers and creatures.
 * Forge of Heroes
 * Gideon's Company
 * Heart of Kiran</c>
 * Jace's Projection</c>
 * Liliana's Scrounger</c>
 * Mila, Crafy Companion</c>
 * Oath of Gideon</c>
 * Price of Betrayal</c>
 * Semester's End</c>
 * Settle the Score</c>
 * Soul Diviner</c>
 * Vorinclex, Monstrous Raider</c> : The player who controls the creature make all counter additions, including Loyalty counters by planeswalkers' abilities, that added to them double. Also, they enter the battlefield with double loyalty counters. Opposing players' planeswalkers enter the battlefield with half the loyalty counters they would normally do and gain half the counters, even the abilities of planeswalkers themselves, rounded down. Also affect spells and abilities that would add loyalty counters overall.
 * All cards with Proliferate