There are other benefits to these spells that make them slightly better than a 1-for-1 exchange, but they do not put you up on cards or any sort of permanents in play, and are therefore not card advantage
But having this effect on 2 instead of 3 is vastly different, plus you can trigger the ability yourself by double-spelling
This uncut card sheet included hand-written notes about the production from Wizards of the Coast, which is likely why it ended up selling for $375,000 at Heritage Auctions in 2024
General Kreat, the Bolt unties both of these approaches in once card, giving you access to it repeatedly from the Command Zone
Heck, they even crafted him some fine armor from that wrecked car
Here's a good one to take a look at: When Sphinx's Revelation was in Standard, many of the decks that played it played four copies