22 cards where the text includes “equal to the number of lands you control” and it’s legal in Modern

Druid Class (Adventures in the Forgotten Realms #180)
Ground Assault (Double Masters 2022 #223)
Dakkon, Shadow Slayer (Modern Horizons 2 #192)
Titania, Gaea Incarnate (The Brothers' War #256b)
Fires of Invention (Throne of Eldraine #125)
Nissa of Shadowed Boughs (Zendikar Rising #231)
Old Man Willow (The Lord of the Rings: Tales of Middle-earth #217)
Rumbling Rockslide (The Lost Caverns of Ixalan #163)
Zendikar Incarnate (Commander 2018 #195)
Ashaya, Soul of the Wild (Zendikar Rising #179)
Stonefury (Commander Legends #203)
Struggle // Survive (March of the Machine Commander #339)
Wrenn and Seven (Innistrad: Midnight Hunt #208)
Beseech the Queen (Planechase #19)
Bonny Pall, Clearcutter (Outlaws of Thunder Junction #196)
Invasion of Lorwyn // Winnowing Forces (March of the Machine #236)
Invasion of Lorwyn // Winnowing Forces (March of the Machine #236)
Road // Ruin (Modern Horizons 2 #212)
Rubblehulk (Commander 2018 #189)
Ulvenwald Hydra (Jumpstart #439)
Beanstalk Giant // Fertile Footsteps (Commander Masters #275)
Cultivator Colossus (Innistrad: Crimson Vow #195)
Molimo, Maro-Sorcerer (Commander Masters #305)

It is the moment of discovery, the triumph of the mind, and the end of these results.