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So, while Flare of Denial is a free counterspell, you need to sac a blue creature

This will limit their ability to play new cards, and when Mawile attacks with Crunch, one energy will be discarded from your opponent's active Pokemon at random, further limiting the offensive ability of the Pokemon in the opponent's active slot or on the bench

Legality depends on the tournament format -- Standard Procedure can be legal in some formats and banned or restricted in others

(9/20/2014) If a face-down creature loses its abilities, it can't be turned face up because it will no longer have a morph ability (or a morph cost) once face up

However, its ability doubles any life you would gain