Stranglehold

Two effects on one enchantment that don't obviously belong together, except they answer the same fear: that the opponent has done their homework. The first clause shuts off every tutor, fetchland, and library-search engine at the table, the second locks down extra-turn loops and the Time Walk effects that close so many combo decks. Both halves attack the same thing, which is consistency. A deck built to assemble a specific pile reliably leans on searching for the pieces and chaining turns to deploy them; this turns both engines off at once and forces the opponent to topdeck their plan. The rate is the part worth dwelling on: four mana for a static lock that asks nothing further of you, with no payment, no upkeep cost, no death trigger, just a flat denial that sits on the board and warps every search-dependent strategy around it. The design discipline is in the word "opponents": you keep your own fetches and tutors, so the asymmetry is total. The card's entire purpose, then, is hostile rather than balanced. It exists to make a particular kind of opponent's deck stop functioning, not to trade resources fairly. Whether that opponent has any answer left depends on what they brought; against a deck whose whole engine is search and extra turns, it can be the difference between a game and a non-game.