Samite Archer
Two pinging effects fused into one Cleric Archer: the prevention shield that defined white's Samite healers since Alpha, and the Prodigal Sorcerer tap-for-a-point that built blue's first proper tempo decks. That pairing is what justifies the second color. Prevent 1 to blunt an attacker or save a creature in a damage race, or tap to snipe an X/1 and grind out the board over many turns; the body never has to swing. The catch is that both abilities share the same tap, so each turn you choose which job to do, and the 1/1 frame means a single bigger attacker walks past the prevention or trades into the body if it ever blocks. What the white half buys is symmetry: a Tim and a Samite Healer stapled together, a repeatable answer to the small, evasive threats that 1/1 utility creatures (mana dorks, weenies, other pingers) tend to be, with prevention holding off whatever the ping can't kill. It is slow by design, a war-of-attrition tool from an era built around multicolor commitment, asking you to pay an extra mana and a turn of setup for the privilege of doing two small things forever instead of one.
