ziggurats can play any sliver, except that ziggurat is limited to 4, only 4 allowed in a deck, just like only up to 4 of any other card in a deck. only basic lands are exempt from this rule. (and relentless rats) In response to Pomato: Slivers are still played and do very well in Legacy Tournament ready decks. But most sliver decks use cheaper ones than this one for the bulk of the deck.
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