Violet Lotus Cloak

At the beginning of your upkeep, if your commander is in the command zone, you
may put a storage counter on target land.
Lands you control have: "{t}, Remove {x} storage counters: Add {x} colorless mana.
If {x} is greater than 5, you may instead add {x} mana of any combination of colors.
Use this mana only to cast your commander."