CardName: Belowstone
Cost: 0
Type: Legendary Artifact
Pow/Tgh: /
Rules Text: The converted mana cost of all cards you own that aren’t on
the battlefield, spells you control, and permanents you
control is reduced by 3. (This does not affect casting cost.
A card’s converted mana cost can’t be less than zero.)
Flavour Text:
Set/Rarity: Temporal Cascade Rare
Belowstone
R
Legendary Artifact
The converted mana cost of all cards you own that aren’t on the battlefield, spells you control, and permanents you control is reduced by 3. (This does not affect casting cost. A card’s converted mana cost can’t be less than zero.)
Future-shifted
Card design by IguanadonsEverywhere (reddit)
https://www.reddit.com/r/custommagic/comments/5g5mcr/the_lowstone_it_lows_its_a_stone_what_more_could/