Paired with the likes of token-makers like Bitterblossom, you can draw at least two more cards per turn for just 1 mana each time
If a card is legal in the current format, either version works
Its worth noting that once in the Spell & Trap Zone or the Graveyard, for all intents and purposes this is a Continuous Spell
With Abyss Proxy Shop, you can play with Earthcraft and every legendary Commander staple you need all without spending a fortune
Playing Survivor One of the recurring things we do in design is have a playtest
Decks that operate almost entirely out of their graveyard, like Dredge, are probably happy enough to use Inquiry, but decks that used Looting for card selection and the ability to dig for a specific card should opt for something that gives them a bit more control over their fate