Marker

A marker is used to represent anything which isn't represented by a card.

The most common marker are tokens, emblems, and counters. Tokens and emblems are usually represented by the marketing cards found in magic booster, while counter are often represented by marbles or dice.

When counter are placed on a player instead of an object it is often helpful to have a marker card to place these counter on:

• Energy Reserve
• Experience
• Poison Counter

Some designations are described "to act as marker":

• Monstrous — Monstrosity
• Renowned — Renown
• City's Blessing — Ascend

Some designations are not described as a marker by the rules:

• Commander
• The Monarch — Monarch
• On an Adventure — Adventure

The Grand Melee variant places great emphasis on turn markers.

From the glossary of the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

Turn Markers

Markers used to keep track of which players are taking turns in a Grand Melee game. See rule 807.4.