This fixed version of cascade only triggers when creatures enter the battlefield, but it still nets you a whole card full of value any time you activate it
They're required to win the game, as you'll need them to gather lore, and to challenge and defeat other characters
At two mana, you can get a decent advantage if Chittering Illuminator lives, and you happen to have some creatures on top of your library
For real why, that's a way to make Treasures and Clues and Food and Blood and Gold and Powerstones and Junk
Some important info to care about is the mana curve and the card type distribution, as it can help us understand better our deck and may indicate where there is space for improving it
You might even see this card appear in aggro-control strategies in other formats