Stonewise Fortifier

The body sets the price; the activated ability is the punchline, and it almost never gets to land. Five mana to make a 2/2 indestructible-in-combat against a single attacker is a defensive switch that costs more than most boards can spare in the turn it matters, and it only ever neutralizes the damage from one creature you point at. That gap between a workable early body and a prohibitively expensive ability is the whole design: this is a fog you fire at exactly one threat, gated behind a mana investment that asks you to have nothing better to do. The damage prevention is targeted and one-sided, so it does not save the Fortifier from a swarm or stop the attacker from connecting elsewhere; it just stonewalls one combat exchange. As a piece of white's long tradition of mana-sink defensive creatures, it sits at the underwhelming end: the floor is a vanilla two-drop, and the ceiling is paying a premium to win a single block you could often have won by simply trading. Filler built to round out a color's bottom of the curve, with an ability priced for a turn you rarely reach.