Overabundance

Adding a mana each time a land is tapped sounds like a payoff, until you read the back half of the clause: each tap costs a point of life, paid by whoever is tapping. That self-inflicted burn is the entire balancing mechanism. The card hands you free ramp on a symmetric enchantment, then makes you pay for the abundance in increments small enough to ignore for a turn and fatal enough to matter over a game. It is acceleration with a metabolic cost, the kind of design that turns mana itself into a resource you spend life to over-extract.

The symmetry is what makes it dangerous to its own controller. Because every land tapped for mana triggers it, opponents draw from the same well, which means the card is only an advantage if you are converting the extra mana into a faster clock than the life loss imposes. Cast it on a turn where you intend to dump your hand and the math favors you; let it sit as a passive engine and it quietly drains both players toward a race nobody asked for. It descends from a strain of early multicolor enchantments that gave away raw power on the condition that you accept a creeping, symmetric tax, trusting the aggressor to be better positioned to absorb it than the durdler across the table.