If a spell, ability, or effect states that a player can do something only any time they could cast a sorcery or only as a sorcery, it means only that the player must have priority, it must be during the main phase of their turn, and the stack must be empty
(Optional): Activate the second effect of "Number C40" by detaching any material ("Number 40" or "Little Soldiers"/"Rouge Doll") to place a String Counter on "Cattle Scream"
You have a lot of mana rocks you probably already run as well as a bunch that serve a utility purpose and can tap for colorless as an alternative ability
Adopted by a male dragonborn named Mehen, she has an identical twin, Havilar, who fights with a glaive and is a bit flighty
Specially designed cards await you
Modern had the same problem, and that price issue had to be alleviated by Masters reprint sets and Horizons sets