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namely, that it couldnt be copied, and, rather than paying life as an additional cost, it should change your life total on resolution

Its good for green decks that are low to the ground, even in a format with Llanowar Elves

Scrap Trawler is the real deal in an artifact based deck in either limited or constructed giving you card advantage for as long as he stays alive and then even when he dies

However, if you want to use this creature as your Orzhov commander or as part of your infect deck, it's an option

If your opponent points a removal spell at your creature, you can Donate that creature to your opponent and draw a card, then the removal spell still kills that creature