Turns out that in EDH we'll just cheat it out with cards like Mayael the Anima or Elvish Piper instead
You do have to have sufficient cards to pitch to it which not only means blue cards but also means cards you can afford to lose
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
Either way, Hyldas doing some work while you're tapping your opponents creatures, and just making a 4/4 elemental creature each time already goes a long way
If it's a land card, you get to play it immediately, because the thresher is just that good of a farmer I guess
Since Krosa grants a global boost to all creatures, it generally benefits decks that go wide with lots of creatures and tokens and creatures with an evasion theme, like flying