You can activate Danger
Cryptic Command | Illustration by Jason Rainville For this list, Im considering blue removal to be anything that removes an opposing permanent from the board by destroying, bouncing, stealing, transforming, or exiling the target
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Sure, it doesnt counter everything -- but creatures are the most common thing your opponent will do, so it will often have targets
Effect wise, I think you could add an effect that strenghtens the summoned monster or protects it from leaving the field for the rest of this turn
Either option on Ensnared by the Mara isnt one your opponent will want to choose