For Tyvar's last ability, you may return any creature card with mana value 2 or less from your graveyard to the battlefield, even if it wasn't one of the three cards milled as the ability resolved
As such, the decks contain a few goes-in-basically-every-deck staples, plus a few stapes-in-the-making
If Locker Room is worth a third of a card I could see Bottomless Pool being worth it, but I suspect Locker Room will be worth less than that
Like most Magic: The Gathering cards, the value of Murder depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Murders at Karlov Manor)
Or just think about how much better Monastery Swiftspear is than Soul-Scar Mage
Foraco Scale (500g x 0.01g) With a microscale, it is possible to determine the exact weight of a Magic card