@Background Human
It only says “one extra mana per mana-making permanent”. No cascading. If your Mox Lotus is making 3, it is now making 4. If your land with the Darksteel enchantment is making 3, it is now making 4. If your elves tap for 1, they now tap for 2. The only problem is that you now need to police the usage of the extra mana.
Apparently multiple instances of mana burn don’t stack, and that makes me sad. Imagine knocking off half your opponent’s life because they have one blue they can’t get rid of.
The extra mana stacks, which is almost as good, but still.
It only says “one extra mana per mana-making permanent”. No cascading. If your Mox Lotus is making 3, it is now making 4. If your land with the Darksteel enchantment is making 3, it is now making 4. If your elves tap for 1, they now tap for 2. The only problem is that you now need to police the usage of the extra mana.
Edited