CardName: Halls of Void
Cost:
Type: Enchantment Land
Pow/Tgh: /
Rules Text: Halls of Void and other lands you control have ":symtap::
Add {1} to your mana pool."
Flavour Text:
Set/Rarity: [Assorted] Card Repository Uncommon
Halls of Void
U
Enchantment Land
Halls of Void and other lands you control have ":symtap:: Add to your mana pool."
Source
Concept: Enchantment lands want some global enchantment effect.
Seems useless... except to make Drifting Island painless.
(Not a fan of enchantment lands myself. Merely experimenting with what designs they would inspire.)