Samite Pilgrim

Damage prevention with a dial: the size of the shield scales with how many basic land types your lands collectively supply, so the same activation that fizzles to a single token point in a one-color build becomes a recurring five-point ward in a manabase stretched across every basic. That places it squarely in the old white Samite-healer tradition (a tapper that shields a creature from a swing or a burn spell), but Domain reframes the effect as a reward for color breadth rather than a flat rate. The structural quirk is that the prevention floats: it sets up a shield before damage is dealt, so you tap during your opponent's declare-attackers step or in response to a removal spell, then let the damage break harmlessly against it. At full size the ward blanks most combat damage or a fireball aimed at a key creature; at minimum it is barely worth the tap. The entire bargain lives in the lands. Build narrow and the activation is close to inert; warp toward a rainbow manabase and you scale a repeatable prevention engine that costs only the tap. The 1/1 body is incidental: what you are paying two mana for is an effect whose ceiling depends on whether your lands cooperate, the whole Domain cycle compressed onto a Cleric.