Fastbond

Alpha's most honest mistake. The card was designed before Wizards understood that "extra land drops" was not a flavor ability but a resource axis, and it priced the axis at a single green mana with a self-damage clause that reads as a drawback and functions as a rounding error. One land per point of life is the best rate the game has ever offered on mana acceleration, because the damage is paid in a currency the format barely taxes while the lands themselves compound: every fetchland crack, every Crucible of Worlds loop, every Exploration-style redundancy turns the "drawback" into a counter the deck wants to tick. Restriction and banishment have followed the card around for thirty years across nearly every eternal and multiplayer format because no errata or reprint context changes the underlying math: a one-mana enchantment that uncaps the land-drop rule is a combo piece in any environment with shuffle effects, landfall payoffs, or a way to convert lands directly into spells. The design lesson got absorbed slowly. Exploration, Burgeoning, Azusa, Lost but Seeking, and Oracle of Mul Daya all walk back to the same idea with progressively tighter restrictions, and none of them have ever needed restricting. Fastbond is the card those designs are apologizing for.