Assuming that every other card is literally worthless (which is a bit of an exaggerationwhile the other cards won't be worth much, a few will probably have a little value), this would be the absolute maximum average price for Unstable basics while the set is in print
If, then, the frame is not helping anymore, change it altogether: Create and start using a new frame for the next 25 years
When Riptide Island is the current plane, for example, each player creates two 1/1 Sliver tokens during their upkeep
All this potential necessities it being banned in Legacy but you can still go wild in Commander and Vintage
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Ponder is one of the most famous cantrips, though there are dozens available