Irenicus's Vile Duplication
Cloning your own legendary creature has usually been a self-defeating exercise: most copy effects hand you the target verbatim, legend rule included, so the duplicate and the original stare each other down until one heads to the graveyard. The clever clause here is that the token arrives explicitly non-legendary, letting the copy and the original coexist and stack their paired triggers or attacks. That single line turns a generic body-doubler into a tool aimed squarely at commanders and other one-of-a-kind creatures: copy your legendary engine, keep both, and let the value compound. The flying rider is smaller but genuinely useful, granting the token evasion the original may lack and an occasional blocker against fliers. What limits it is the tempo bill. At sorcery speed and four mana, this builds board rather than saving one: you are spending a whole turn, and the target has to earn the pace you give up. Aim it at a vanilla creature and you have overpaid for a worse Clone; aim it at a value-dense legend and the sorcery timing stops mattering, because there was never a reactive window you wanted this in anyway.
