Giving your artifact creatures flying/lifelink can be strong, but you have to be built for proliferation effects, artifacts, and payoffs for the actual counters from proliferating
Its mere existence meant we could make cards that cared about that permanent being on the battlefield
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Reds aggression means that you often get a lot of instant and sorcery spells that dont cost much mana and can deal direct damage to creatures or even other players
When paired with cards like Donatello, Gadget Master, who, as we already know, can create tokens of artifacts you control, Krang, Master Mind becomes a game-changing threat that needs to be dealt with, or your opponents are doomed.
The name comes from the fact that the deck doesnt win quickly but does so by slowly bleeding the opponent to death