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I covered some excellent replacements for expensive staples in last weeks article, which is a great first step toward building better budget decks

You can cast Black Sun's Twilight without a target (presumably with X equal to 5 or more) just to return a creature card

Ive also found it impactful in token lists using enchantments and planeswalkers like Bitterblossom and Elspeth, Sun's Champion for token production as you can easily line up a bunch of tokens coming into play before casting this

You are able to shut down a lot of fun stuff

However, those are so legendary that they tend to be sold graded or via specialized auction houses, not on the open, secondary card market