Growing Hallucination

During your upkeep phase, put a 1/4 blue Illusion token with "When this creature becomes the target of a spell or ability, sacrifice it." onto the battlefield.
{u}: Put a 1/4 blue Illusion token with "When this creature becomes the target of a spell or ability, sacrifice it." onto the battlefield. Each time this ability is activated, its cost increases by {1} until end of turn. (This increase is cumulative, but is not retroactive.)