Use Marrow-Gnawer's ability to sacrifice one of your rats to make two more 1/1 Rat tokens
If the triggered ability doesn't resolve (because, for example, it has been countered), the cycling ability will still resolve, and you'll draw a card

Decklist: Undying Yawgmoth in Modern Strangleroot Geist | Illustration by Jason Chan Planeswalker (4) Creature (27) Birds of Paradise x4 Blood Artist Geralf's Messenger Ignoble Hierarch x4 Scavenging Ooze Strangleroot Geist x4 Wall of Roots x4 Yawgmoth, Thran Physician x4 Young Wolf x4 Instant (4) Sorcery (4) Land (21) Misty Rainforest x2 Nurturing Peatland x2 Overgrown Tomb x2 Blooming Marsh x3 Dryad Arbor Forest x2 Swamp Twilight Mire x2 Urborg, Tomb of Yawgmoth Verdant Catacombs x4 Yavimaya, Cradle of Growth Sideboard (15) Agatha's Soul Cauldron Endurance x4 Force of Vigor x2 Necromentia x2 Obstinate Baloth Outland Liberator Scavenging Ooze Thoughtseize x3 Modern Yawgmoth uses the decks namesake card, Yawgmoth, Thran Physician, and the several undying creatures to loop drawing cards, draining your opponent of life, and clearing the path for lethal by shrinking opposing creatures

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