The latter includes cards like Be'lakor, the Dark Master, Pantlaza, Sun-Favored, and The First Sliver
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Every sliver you cast will eventually trickle down to a 1-mana card, which makes it very easy and consistent to get your Galerider Sliver online
All these options are significantly less expensive than buying Cyclonic Rift, and they come with various advantages: they're cheaper to cast, they deal with permanents permanently, and as artifacts they can be tutored up easier with cards like Whir of Invention
If their deck utilizes the graveyard, then Faithless Looting is even better and has no downside at all
Berserk was, of course, eventually unrestricted in Vintage, as well as being legalized in Legacy