Illusionary Servant

Three power and four toughness with evasion for three mana is a body that has no business sitting at uncommon, and the sacrifice clause is what buys it that statline. Point any spell or ability at it (a removal spell, a bounce, even your own pump trick) and it evaporates before the effect resolves. The trigger is a clean piece of cost-accounting: the card pays for its stats not by being fragile to combat or to sweepers, but by being fragile to targeting itself, which inverts the usual relationship between a creature and an answer. An opponent does not need a spell that can kill a 3/4 flier; they need any targeted effect at all, and the cheapest one in their deck does the job, because the act of targeting is lethal regardless of what the spell was meant to do. The discipline cuts both ways: the controller can never point anything at it either, so no auras, no combat tricks, no protective spells. The body is yours to swing and nothing more. That undercosted statline is what makes the Illusion archetype a real strategy rather than a liability. Against a deck thin on targeted interaction, this is a clock that flies in for three with no offsetting weakness; the only way to break it is the one kind of answer many decks lean on by default, which is precisely the trade the design is selling.