Riptide

Tap all blue creatures, for one mana, at instant speed: it is a color-hosing one-drop aimed at a board state its own era almost never produced. Blue, in this period, was the color of counterspells and card draw, not creatures worth tapping down, so the effect reads like a mass-Twiddle built for a mirror that rarely materialized. That mismatch is the whole story. The design logic is frozen in amber: early Magic reasoned that a cheap instant pointed at a single color by name was a fair tax on whoever was abusing it, and "tap all blue creatures" assumes a battlefield with enough blue bodies to fire at. The instant timing is the one piece that still reads as careful. It was meant to ambush an attack or freeze blockers, a combat trick that needed an opponent fielding blue creatures to mean anything at all. The bodies were the part the design got wrong. What makes the card worth remembering is that assumption, the idea that hosing a color meant hosing its creature type rather than its actual game plan, captured before the game learned the difference.