Shield of the Oversoul
Most pump Auras scale with one quality of the creature underneath them. This one reads its host's color and grants a separate package for each color it finds: green hands the creature indestructible plus a size bump, which matters most on a body already winning combat; white hands it evasion to push damage through. The conditional layering is the entire design. Land it on a creature that is both green and white and the clauses collect together, leaving a +2/+2 flier that "destroy" effects cannot touch, and the gold or hybrid bodies of an allied two-color shell are exactly the targets that turn this from a respectable enhancement into a near-unkillable evasive threat. That is the wrinkle: the Aura asks you to care about your creature's colors, not just its stats. The indestructible clause is carefully bounded, too, spelling out that lethal toughness reduction still works, so a wrath that sets toughness to zero or a -X/-X effect routes around protection that targeted removal cannot. The investment risk is the structural cost of every Aura (a single removal spell trades two cards for one), but here the green half answers exactly the removal that would otherwise punish the commitment, so the more the host already wants to be protected, the more this earns its place on it.
