Also, most of those Alchemy-only cards have Rare or Mythic Rare status, and earning wildcards to spend on those rarities has never exactly been easy in this game, so players will likely have a harder time completing their collection or building decks with the new cards without more time/money investment
Also, the lack of a card draw could make it hard to get this going, especially if you are running low on cards
Bloodline Keeper is exactly what you want in a Commander deck
Unless you specifically collect vintage cards, reprints offer better value
Scion of Oona At worst, this is a fairly standard lord with a slight downside (hexproof would be a vast improvement over shroud), but at best, this is the card that can mean the difference between every creature you control getting themselves killed, or doing the killing themselves