Cache de mana {1}{R}{R}

Enchantment

At the beginning of each player’s end step, put a charge counter on Mana Cache for each untapped land that player controls.

Remove a charge counter from Mana Cache: Add {C}. Any player may activate this ability but only during their turn before the end step.

Illustrated by rk post

Standard
Brawl
Pioneer
Historic
Modern
Pauper
Legacy
Penny
Vintage
Commander