Boom Scholar

one generic mana one red mana one green mana Creature — Goblin AdvisorPower and toughness3/3

Exhaust abilities of other permanents you control cost two generic mana less to activate.

Exhaust — four generic mana one red mana one green mana : Creatures and Vehicles you control gain trample until end of turn. Put two +1/+1 counters on this creature. (Activate each exhaust ability only once.)

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Showing Aetherdrift#189

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6 printings

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Boom Scholar rulings

2025-02-07
Boom Scholar’s first ability can cause the mana component of the cost to activate an ability to be .
2025-02-07
Exhaust abilities can be activated any time you could normally activate an ability.
2025-02-07
If an exhaust ability of a permanent is activated, and then that permanent leaves the battlefield and returns to the battlefield, it becomes a new object so its exhaust ability can be activated again.
2025-02-07
If an ability triggers whenever you activate an exhaust ability, that ability resolves before the exhaust ability resolves.

Boom Scholar keyword rules

Exhaust Rule 702.177

An exhaust ability is a special kind of activated ability. “Exhaust — [Cost]: [Effect]” means “[Cost]: [Effect]. Activate only once.”

An effect may allow you to take an action as long as you haven’t activated an exhaust ability this turn. Such an effect allows that action only if you haven’t begun to activate an exhaust ability this turn.