Sliver Gravemother

The Sliver creature type spent two decades wanting a graveyard, and here it finally gets one. Slivers reward width above all else, and the tribe's oldest tension is that a mass wrath resets everything you have built. This design turns that setback into fuel: every dead Sliver in your graveyard gains encore priced at its own mana value, converting the pile into a recurring source of one-shot copies. The encore mechanic itself does the balancing, since each activation exiles the card and the tokens are sacrificed at end of turn, so the graveyard functions as a battery you drain rather than a loop you spin. The suspension of the legend rule for your Slivers matters more than it reads, because the tribe leans on legendary anthem-Slivers that older builds could only run as singletons; now the copies stack. It is a five-color commander built to want the whole tribe, which is exactly the point of anchoring it in every color a Sliver has ever been printed in. The 6/6 body and its own encore give it a closing plan even from the graveyard, but the real work is structural: it takes the tribe's historical vulnerability to board wipes and makes it the fuel line, and it is the first Sliver leader that treats the graveyard as an asset to be spent rather than a place Slivers go to stay dead.