Im talking about cards like Docent of Perfection (hey, Orvar is a wizard!), Murmuring Mystic, Talrand, Sky Summoner, and Metallurgic Summonings
Currency Converter has a you may clause, which Bag of Holding lacks - letting you decide whether or not you exile the cards
One factor working against Buckle Up is its price, as the only listings on TCGPlayer right now are almost $150
If you dont have lots of resources in your hand, you can also sacrifice a scarecrow specifically to draw a card, then use Scarecrones activated ability to bring it right back
Use the abilities of your cards
By including a swath of card types in your deck, and having ways to smartly fill your graveyard, you can gain some pretty powerful benefits on your creatures and spells by hitting the four or more different card type requirement.