Duress, Thoughtsieze and even Inquisition are the best way to deal with the very few combo decks that can outpace you as well as the control decks that have some brutal counters to you
Currency Converter has a you may clause, which Bag of Holding lacks - letting you decide whether or not you exile the cards
The great thing about Yshtola is that she can prompt card draw when opponents attack each other and even you
Im talking about cards like Docent of Perfection (hey, Orvar is a wizard!), Murmuring Mystic, Talrand, Sky Summoner, and Metallurgic Summonings
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.
None where satisfactory and either ruined the balance of the cards or just made the games really dull