Displacer Kitten
The engine reframes what a flicker is supposed to cost. Historically, blinking one of your own permanents meant spending a card and a slot on the effect itself: an Ephemerate, a Flickerwisp, a Cloudshift. This body inverts that math by attaching the blink to something you were already doing (casting a noncreature spell), so the reset rides along for free. That inversion is where the abuse lives. Any nonland permanent with a strong enters-the-battlefield trigger becomes a recurring resource each time you cast an artifact, instant, sorcery, enchantment, or planeswalker: the permanent leaves and immediately returns under its owner's control, retriggering whatever it does on arrival. It also functions as a free untap, since the returned permanent comes back fresh, so a mana rock already tapped this turn can be blinked and tapped again. Chain enough of those and the spells that fuel the trigger stop costing net mana at all. Note the ownership clause cuts both ways: a permanent you have stolen goes back to its original owner when blinked, so the loop only compounds on things you own outright. The counterweight is fragility: a 2/2 with no evasion (Avoidance labels the triggered ability, not any protection or keyword) is trivially answered, and the whole machine collapses the moment the Cat leaves the battlefield. Where earlier "free trigger on a stick" designs keyed off combat or upkeep, this one keys off the act of casting, which is why decks built around it tend toward maximum noncreature density.
