Keeping Pace : If you're playing against decks with strong card draw, you need to keep pace
You've got the shock lands Blood Crypt, Steam Vents, and Watery Grave
Not all base Mystical Archive cards are hugely valuable, as some of them are common and uncommon
Four mana is a lot for either a CounterspellCounterspell or a BoomerangBoomerang, much less a slightly better version of both, and Doc AurlockDoc Aurlock isn't even providing a discount on that half of the card
Card Name Mana Cost Type Legendary Creature Halfling Scout Rarity Uncommon rules Text Whenever Frodo Baggins or another legendary creature you control enters, the Ring tempts you.As long as Frodo Baggins is your Ring-bearer, it must be blocked if able
However, it is a 1 mana cantrip we can reuse