CardName: Lavabubble Mountains
Cost:
Type: Land
Pow/Tgh: /
Rules Text: {T}: Add {1} to your mana pool.
{1},{T}: Add {R} to your mana pool. If you spend this mana
on a spell which deals damage to a single target, it deals
that much damage plus one instead.
Flavour Text:
Set/Rarity: Multiverse Design Challenge None
Lavabubble Mountains
Land
: Add to your mana pool.
,: Add to your mana pool. If you spend this mana on a spell which deals damage to a single target, it deals that much damage plus one instead.
A good example of mana-with-bonus is giving some bonus to a spell you spend it on. But I struggled to find an example which felt to me more like "special mana" rather than "makes mana, and separate ability to tack an extra onto a spell". I'm not sure how well this works, I hoped it would feel more like enhancing a spell than adding something unrelated.
: Add 
to your mana pool.
to your mana pool. If you spend this mana on a spell which deals damage to a single target, it deals that much damage plus one instead.
See Challenge # 107.
A good example of mana-with-bonus is giving some bonus to a spell you spend it on. But I struggled to find an example which felt to me more like "special mana" rather than "makes mana, and separate ability to tack an extra onto a spell". I'm not sure how well this works, I hoped it would feel more like enhancing a spell than adding something unrelated.