Yeah you got almost 7x the value for your 2$ card but got paid 50 times less per hour worked With that in mind, separate out what you feel is worth selling individually from the rest
Study the Popular Decks Sideboard cards are only useful if you, well, use them
Giving only your Slivers flying is a departure from the usual flair of Slivers giving all creatures that share the type an ability, but it does make it the best way to give your Sliver creatures evasion
As my favorite YouTuber would say, look to buy at least three booster boxes, so you have some options
It's a little novella written into the card, but basically Dance of the Dead resurrects a dead creature with this Enchantment attached to it, and a buff to boot
Incorporating cards like Sign in Blood and Read the Bones gives you early game draw options without breaking the mana or life bank