Last time, the set didnt provide any stand-out Elves
Ranger-Captain of Eos (Modern Horizons) White is a color that often cares about creatures, particularly small ones
These can create much quicker and more efficient mana bases, so their return to Standard will be a big shakeup to competitive play
Other possible combinations certainly exist within Blast From The Past, but they'd generally prefer to be in decks that are dedicated to their respective themes
Black can kill or sacrifice creatures to draw cards, or make mana from creatures dying
Dwarves usually have synergies with Treasure, so sacrificing a Treasure and attacking with a 3/3 double strike is good enough, and it gets better when typal synergies or equipment are added into the mix