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Often you see Omnath in Yorion, the Sky Nomad Control/Midrange strategies since you are running more lands to meet the companion criteria

No, menace is not an activated ability, it is a keyword ability that is static and requires no resource cost

For example, if you're instructed to draw two cards and you replace the first draw with a dredge ability, another card with a dredge ability (including one that was put into your graveyard by the first dredge ability) may be used to replace the second draw

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It can also get you out of a particularly scrappy combat that would otherwise knock you out of the game