Primarily both are played as a two drop that draws a card, the elf is just a body to be done away with via Skullclamps etc or offer up synergy for better elves where as the wall is more of a speedbump against aggressive decks
Legendary Creature - Zombie God Color tag templates(None) Immaculate Magistrate : Put a +1/+1 counter on target creature for each Elf you control
There are some more minor options in Red and Black utilizing more of a ritual-style ramp effect, but outright ramps is a bit more of a rarity, especially on ETB creatures
Font of Progress: Its mill tech, but more importantly, an optional self-mill
It can be used to flicker any of your team's creatures if they have a good enter the battlefield ability
The Eldrazi are otherworldly beings of great hunger and power that all-but annihilated the planes of Zendikar and Innistrad, and that power can be yours (in Commander)