Hatchery Sliver

Sliver design usually scales the tribe with a static effect: an anthem that pumps the board, a keyword shared across every body, a resource engine that ticks with each creature down. This one attacks the problem from the casting step instead, granting every Sliver spell you cast a replicate cost equal to its own mana cost. The tribe's cheap creatures turn into copy engines the moment you put them on the stack, and because replicate is announced when you cast, you decide how wide to go before the spell ever reaches the battlefield. There is no discount: each extra copy costs the full mana cost of the spell, so this is a snowball paid for in mana, closer to a token-doubler grafted onto the cast than to the anthem-lords the tribe usually leans on. The timing wrinkle is that replicate fires as a cast trigger, an ability that goes on the stack and must resolve before the copies exist. That resolution decouples them from the original: countering the initial spell does not stop the trigger, and the copies still resolve and become tokens on their own. An opponent can answer each copy individually, since they are separate objects on the stack, but only a response to the replicate trigger itself unwinds the whole play. Its ceiling is a board assembled in one turn from a single card and a pile of mana. Its floor is a 2/2 that did nothing because you had neither the mana nor another Sliver to chain behind it.