Which of those big token spells with flashback do you like? Which you don't? And why?
Well, they're quite different. Rise of the Ants is the most basic and least interesting, I'd consider it for a "learning the game cube" that showcases some mechanics like flashback, but I don't get excited to draft it. I would not cube it for the lifegain synergy.
Grizzly Fate is the most graveyard-cube oriented one from a synergy pov. I don't really like the card, but I think that's in large parts because I didn't understand what the card did when I opened it in a booster as a kid, having no concept of what tokens were.
I quite like Beast Attack and have it in my cube, I think games are more fun when you can play at instant speed, but it has a very big color requirement, which is a bit off-putting.
Roar of the Wurm is probably the most "fun" of them, since you get to feel like you cheat a bit if you can get it into your graveyard through other means. I play the hydra instead for the Fauna Shaman and
Dreadhorde Invasion synergy though.