Ring of Gix

Tappers had been around since Icy Manipulator, but they came stapled to a body or a steep activation cost. Here the tap effect lives on a cheap artifact that costs only one mana and a tap to use, repeatable every turn, and the cost of that efficiency is paid up front: echo means the artifact arrives, then demands its full cost again at your next upkeep or it goes away. That structure is the whole design. You spend three to deploy, then choose whether the lockdown is worth a second three to keep, which turns a permanent into a kind of installment plan. The activation reaches further than most tappers of its era: artifact, creature, or land, so it can lock down a mana source, blank an attacker, or freeze an opposing engine piece without caring what type it is. Tapping a land before an opponent's draw step is a soft mana denial; tapping a blocker clears a path; tapping a tapper answers a tapper. None of it costs much per use, which is the point of paying the echo tax once to keep the engine running. It belongs to the run of artifacts that turned Urza-block's cost-reduction and untap engines into outright lockouts, the kind of incremental control piece that reads as modest and plays as a slow vise.