Memorial to Genius

The trade is the whole proposition: a land that comes in tapped and produces blue, then later eats itself to refill your hand. The cycle of "Memorial" lands all run this same template (a tapped single-color source that converts into a relevant effect once the early turns are behind you), and this is the card-advantage member. Five mana plus the land itself to draw two is a steep rate by spell standards, but that is not the point of comparison; the point is that the cost is paid entirely from a land slot, so the card never competes with your real spells for deck space. You spend it as an Island early and cash it for cards once you have floods of mana and nothing better to do. What makes it fit a blue attrition plan is the timing: the draw is instant-speed, so it slots into the mana you were already holding up for interaction. Cast nothing on the opponent's turn, and you sink that untapped mana into two fresh cards at their end step rather than passing it wasted. The friction is real: it enters tapped, the activation is expensive enough to gate it behind a developed mana base, and sacrificing it shrinks that base at the moment you draw. That puts it firmly with grindy blue decks that want their lands to keep working in the late game, when they have stopped wanting more lands and would rather turn a spare tap into cards.