If an effect allows you to spend mana as though it were mana of any color or type, that allows you to spend mana you couldn't otherwise spend, but it doesn't change what mana you spent to cast the spell
Imagine attacking Robert for lethal damage and then Harsh Sustenanceing Rachel for lethal as well
Max Goof Rockin Teen, for example, boasts powerful vocal cords with Singer 5
Some sets, like Unglued and Unhinged took it a step further and were the first ones to supply full-art lands for the five basics, something thats become common practice in regular MTG sets
If you just look at the Vehicle here, the rate's not great
But getting top Mythic not only gives you the chance to participate in Qualifier Weekend but also rewards you with free gems, so it's worth taking that into account