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With this move I wish Mewtwo's retreat cost wasn't so high because I would get the defending Pokemon asleep as fast as possible then move in a Pokemon like Snorlax who has moves that does more damage if the defending Pokemon is asleep, if somehow I could get retreat costs to be much lower for all Pokemon I would switch back and forth between Mewtwo and another card quite rapidly

With all this simplification, what effect does it have on the game

Rock - Possibly related to the phrase Kill two birds with one stone. Birds are also very lightweight, so rocks can easily weigh them down

I would recommend just playing her in everything

the fake first edition stamp