Although of course, if you include subtypes that are now considered evergreen, then technically the first set to do this was Alpha , which introduced the subtypes Plains, Island, Swamp, Mountain, Forest, and Aura (although the actual "Basic Land - Plains" and "Enchantment - Aura" templating wouldn't come until much later)
They choose a creature they control, then you choose a creature you control
Dragon's Approach provides a burn spell with the ability to search for powerful Dragon creatures, creating a deadly combo
Then after that, a slot which could contain a serialized Uncommon from the set of 65
Plus, sticking to a mono-color strategy in Commander is a surefire way to keep things budget and affordable