How about discarding a land and drawing an extra card with The Gitrog Monster, or playing that land from your graveyard with Conduit of Worlds
In particular, the cycle of Elemental Incarnations (including Grief, Fury, Solitude, Subtlety, and Endurance) from Modern Horizons 2 have taken Modern by storm, giving a wide variety of decks access to incredibly powerful cards that can be cast for zero mana and easily recurred
However, there are a few things that can help them produce infinite value
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Turn three - Attack for 7 damage with Prospector, Piledriver, and Warchief Turn four - Attack for 21 damage
How Powerful Is Sanguine Bond x Exquisite Blood