Singing Tree

Defensive tap-down creatures are a forgotten branch of early Magic design, and this is the most extreme specimen on the tree. The ability does not deal damage, does not destroy, does not even prevent: it reaches into the combat math and zeroes out the attacker's base power, leaving a creature whose damage will usually have collapsed to nothing. For a 0/3 body at four mana, that was the trade Wizards offered in 1993, when combat tricks and pump effects were rare enough that "base power 0" actually held through the turn. The design belongs to a small family of green walls-with-a-job that tried to give the color a non-damaging answer to attackers without printing removal: Fog handled the whole swing, this handled one creature at a time and stuck around to do it again. The cost-to-effect ratio reads as absurd by any modern standard, but the card is a fossil of a moment when designers were still working out what green was allowed to do to a combatant without killing it. The mechanic itself (modifying base power as a tap ability) has barely been revisited, which makes the card more interesting as a design artifact than as a creature: a road green stopped walking down almost immediately.