Sanctum of Fruitful Harvest - 203 U M21

At the beginning of your first main phase, add X mana of any one color, where X is the number of Shrines you control.
Beneath bright blossoms
Verdant with spring's rich bounty,
The soul blooms in song.
uncommon
Legendary Enchantment — Shrine
From the Magic: The Gathering set Core Set 2021.