Sea Gate Oracle

The cantrip-on-a-body archetype distilled to its most reprintable form. A 1/3 blue body blocks the early creatures that matter while the enters-the-battlefield clause replaces the card you spent, smoothing draws without committing you to a fragile two-card engine. The selection is the cleaner part of the design: looking at two and keeping one filters toward your best line, while the rejected card going to the bottom rather than the graveyard quietly denies a payoff to any deck that wants its library full of fodder. What earns the card its long shelf life is the way the body and the value attach to each other: the 1/3 is the floor that keeps the slot from being a dead draw against aggression, and the card advantage is the ceiling that keeps it relevant when the game goes long. That dual role is also why it became a workhorse for blink and reanimation strategies, where the entry trigger is the whole reason to flicker or recur it; the body is incidental once the card stops being a creature you cast and starts being a trigger you abuse. Plenty of designs have done the same job since at lower rarities and tighter rates, but this remains the template they were measured against: a defensive blue creature that pays you back the moment it lands.