MTG Wiki
Level counter
Use Level tracking
Placed On Leveler cards
Introduced Rise of the Eldrazi
Last Used Rise of the Eldrazi
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oracle:"Level counter"

Level counters are exclusively used by the Level up mechanic. They are used to track levels on Leveler cards.

Outside of that, three other cards refer to them; Venerated Teacher accelerates your levelers, while Time of Heroes and Champion's Drake check for level counters as secondary payoffs.

Level counters don't interact with the levels on Class cards.