Marrow-Gnawer [Mystery Booster] Hachette UK if this effect was activated

if this effect was activated this turn (and was not negated): You can Special Summon this card from your GY

it produces {B} instead of any other type and amount

Set: Sun & Moon: Black Star Promos Type: Water Rarity: Promo Retreat cost: Colorless

"O to Be a Dragon"

Marrow-Gnawer [Mystery Booster] Hachette UK if this effect was activatedSet: Mystery Booster Type: Legendary Creature Rat Rogue Rarity: Rare Cost: {3}{B}{B} All Rats have fear. {T}, Sacrifice a Rat: Create X 1 1 black Rat creature tokens, where X is the number of Rats you control. Marrow Gnawer united three nezumi gangs when he slew their leaders in a single night. Now they call him their first lord.