A Brief History of the Archetype First and foremost, some background: Polymorph, from which half of these strategies derive their name, was first printed in 1996's Mirage, and allowed savvy deckbuilders to swap between creatures in a semi-random manner, by pivoting between what existed on your battlefield, and what creature(s) lurked near the top of your library
Speaking of big creatures, if you are the rare green deck that doesn't have any, Khalni Ambush drops from great to medium or even bad, but since big creatures are more or less green's thing, it's hard to imagine too many green decks that won't get value out of the instant-speed fight spell
Although that is the kind of mode you want on these cards it is so specific and situational that it feels like a massive rip off on the few occasions it has been used
Ask any long-time Magic player about their worst trade, and youll have to watch their shoulder slump and their voice crack as they recount the time they traded an Underground Sea for a Shivan Dragon, or a Mox Pearl for a playset of Jesters Caps
Then sacrificing dorks for cards became a thing and now Black usually either sacrifices dorks or pays life for card draw
