You know exactly what youre getting, with no guesswork and no pack-opening roulette
Protecting Marton The downside to Marton is that his ability doesnt boost himself, and hes just a 1/1 charging into battle boosting all your other attacking or blocking creatures
Overlord of the Boilerbilges and Overlord of the Mistmoors both fit nicely into the aggro strategies for red and white respectively
Some spells like Iraxxa, Empress of Mars and Keeper of Secrets extend this support to include cards cast from the library or through flashback
In addition to being able to consistently bolster one's numbers, this creature is also able to provide a safety net in the form of life-gain, causing its controller to gain life equal to the toughness of elf creatures they control as they enter the battlefield
Because people like me, presumably, are a good slice of Wizards of the Coasts target demographic