What it does
Exert is an optional ability you choose to use as you attack. When you declare a creature with exert as an attacker, you may exert it to get a bonus effect—usually something like extra power, drawing a card, or a tap effect. The trade-off: an exerted creature won't untap during your next untap step.
The most common mistake is thinking exert taps the creature or that it must be tapped to exert—it doesn't. Exert is purely a choice made during attacker declaration, and the creature still taps normally as part of attacking (unless it has vigilance, in which case it stays untapped but is still "exerted," meaning it skips its next untap). Also, you can only exert when attacking, not when blocking.
In Commander, exert shines with untap effects, vigilance, and blink—anything that sidesteps the skipped untap lets you exert every turn for repeated value.
Iconic cards with Exert
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