All of the Merlin cards give an ability when returned to hand, like the Merlin Crab which gives another character +3 strength when challenging, when they are played, and when they leave play (which can be in the same turn for a super boost), and Madam Min returns cards to hand when played
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Games just finish faster in these environments, and the ramp that mana dorks deliver in early turns is almost always worth the risk of having these effects stapled to weak creatures
If the copied permanent is copying something else, then the token enters the battlefield as whatever that permanent copied
In such cases where a deck seems to be classified quite high or quite low, it is a good idea to analyse it by itself, where you get an estimate per card of how the scoring system scores it