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
NIBELHEIM AFLAME Chandras Ignition lite for one less mana, but with the ability to flashback for some card draw / selection
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)
Bloodtithe Harvester Bloodtithe Harvester does double duty as both an attacker and removal piece
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
Font of Progress: Its mill tech, but more importantly, an optional self-mill