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Battle Screech is an example of a card that was originally printed at uncommon in Judgment but was reprinted as a common in Vintage Masters and Commander Masters

To my knowledge this first became popular when Glads came onto the stage and I assume so probably because of major stun factor combined with brutal control and setup for safer Bestiari plays

The two archetypes come with many ways to control the board

You can then flip it face-up for six mana, and that gets one cheaper for each instant and sorcery card in your graveyard

They are all colorless because Mishras Workshop or Ancient Tomb is just too good and there are enough crazy ramp lands in the older formats to support a deck like that