Selling cards individually is time-consuming, as you need to price, photograph, and list each one
Then, if you have 3 or less cards in your hand, draw 1 card
Does Trample Go Through If My Creature Dies
If the card has any mandatory additional costs, such as that of Momentous Fall, you must pay those to cast the card
The contents of Secret Lair x Hatsune Miku: Sakura Superstar are: Shelter Miku, Lost but Singing (Azusa, Lost but Seeking) Miku, the Renowned (Feather, the Redeemed) Inspiring Vantage Miku's Spark (Chandra's Ignition) Harmonize Of the six cards in the drop, half of them are worth $5 or more even in their basic printing so you expect Miku, Lost but Singing, Mikus Spark, and Miku, the Renowned to have particularly high resale value (thats assuming, of course, youd be willing to part with them)