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You can exploit milling your mono-color opponents to produce more tokens, and you can even use cards like Painter's Servant to make more tokens or combo off with Grindstone

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To use the Autobuild feature, make sure all cards are added to your inventory

They also cant be countered by counterspells that say counter target spell. But some counterspells are capable of countering them, like Voidslime or Disallow since they specifically name activated abilities as something they can counter

I wasnt playing actively in this period, but as I understand it, creatures were quite a bit more expensive in those days, so maybe this could actually be useful