With the increased popularity of the Commander format over the years, Wizards of the Coast has been busy slowly pushing more and more card draw spells into White and Red (and even Colorless)
309.5b: If a player ventures into the dungeon while they own a dungeon card in the command zone and their venture marker is on that dungeon cards bottommost room, they remove that dungeon card from the game
If you need more mana to wipe out behemoths later on, chances are that it is available for you
It has utility for other enchantment creatures as well, like Eerie or Constellation triggers
Magic: The Gathering Assassin's Creed Preview Events Debut and Previews Begin on WeeklyMTG : June 18 Card Image Gallery and Previews Complete : June 21 Global Tabletop Launch : July 5
For example, with the new Vivien, Champion of the Wilds, you can cast your werewolves on the end step before your turn, then not cast anything on your own turn, transforming your werewolves (if nobody else casts an instant spell)