This Bloomburrow bards a bird in addition to its other creature types, it flies, and it clones cheap creatures really well, while having synergies with X spells and ninjutsu you can bounce it back to your hand and copy another creature later
So yeah, this is a situation where the circumstances of the small sets made them more exciting than the other sets, especially since the mechanics had become familiar at that point
This includes the Dogmeat-centered Scrappy Survivors deck, Mutant Menace, Hail, Caesar, and Science
The Best Cards With Split Second Spells with split second tend to cost a little more mana than their more interactive equivalents, so the best ones are either mechanically unique spells or effects that you need to resolve without your opponents' interference
Just how good could it really be