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Marchesa, the Black Rose : When I build Marchesa decks, I use plenty of creatures that naturally enter the battlefield with +1/+1 counters, which means that, with Marchesa, the Black Rose on the battlefield, we can feed one to emerge without going down a card

But a decade later, Wizards would print Protean Hulk, which turned Flash into a Turn 1 win thanks to a convoluted loop of creatures that you can tutor up by using Flash to not just cheat the Protean Hulk into play but immediately sacrifice it, which was oddly an upside due to Protean Hulk's death trigger

In Cube, there has been some talk about this card and some lists are trying it out

You can do this to draw a card after your mana is set or in response to the massive recursion and graveyard (ab)use at the Commander table