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On the battlefield, you need Marrow-Gnawer without summoning sickness, and you need at least two other rats

Damaging EX/GXes for free every turn is good for us players of low GX count decks

Finally, you can spend 9 loyalty to activate: If target player has fewer than nine poison counters, they get a number of poison counters equal to the difference. All you have to do then is add another poison counter somehow - say, by proliferating - and that opponent is dead

It can be cast very early and is incredibly easy to do highly powered things with it

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Technically ramp decks are threat light if you consider all ramp effects to be entirely non-threats