Protean Thaumaturge

Clone effects usually cost you a creature to name a target and lock in your choice at cast. This one inverts the timing entirely: it enters as a modest 1/1 and stays that way until an enchantment enters the battlefield under your control, at which point it can shed its body and put on someone else's. That decoupling is the whole design. The copy is not a one-time cast decision but a repeatable constellation trigger, and because the trigger fires on any enchantment entering (an enchantment spell resolving, sure, but also a token being made, an aura flickered back, or a permanent reanimated), the same 1/1 can chase whatever the best creature on the battlefield happens to be at that moment, upgrading itself again the next time the count ticks up. The self-referential clause (it copies everything except keeping its own copy ability) is the safety valve: without it the effect would evaporate the instant it became something else, and the entire point is that it keeps transforming. Blue clones of this shape care less about the thing being copied than about the machine that decides when to copy it. The old Clone problem is that its power is purely reactive, hostage to the board in front of it; tying the trigger to a deck's own enchantment count hands you partial control over when that reaction fires.