Quantum Entanglement

A repeatable blink engine folded into a permanent, priced so the flicker is a payment rather than a guarantee. The enchantment itself asks nothing beyond its own casting; the value comes from the optional you can spend both on entry and at every end step, resolving as a triggered ability whose target you choose when you pay. That structure matters twice over. Because the exile-and-return rides a "when you do" reflexive trigger, an opponent gets a window to respond to it, and because it fires at your end step, it re-arms one enter-the-battlefield ability of your choosing on a clock nothing else needs to prompt: a Blade Splicer's golem, a value-drone's card draw, a token-maker's payoff, refired on your terms each turn. Note the limits the phrasing enforces: it exiles and returns the actual creature card, so a token blinked this way is gone for good rather than reappearing, and any creature it flickers returns summoning-sick. Flash is what changes the axis. Most sustained blink outlets sit at sorcery speed or hang off a creature that has to survive; landing this at instant speed lets you hold up the payment as a response, dodging a single-target removal spell by exiling the creature before that spell resolves and returning it fresh, counters and auras stripped in the trade. The recurring cost is the honest part: two mana per end step competes with everything else you want to be doing, so each activation is a real choice rather than a free trigger. What it buys in exchange is permanence, the option kept open every end step for as long as it survives.