Returning two small things from the 'yard to play for five or six mana doesn't sound that awesome, but ReveillarkReveillark makes up for the somewhat restrictive cost with combo potential alongside Karmic GuideKarmic Guide and Viscera SeerViscera Seer: Saffi EriksdotterSaffi Eriksdotter and Altar of DementiaAltar of Dementia work as combo pieces, too, among other options, making the 'Lark an important role player in decks like Teysa KarlovTeysa Karlov, Karador, Ghost ChieftainKarador, Ghost Chieftain, and Alesha, Who Smiles at DeathAlesha, Who Smiles at Death
It was the first card I thought of when I thought Black Ramp
Plays well with : Polyraptor and Ripjaw Raptor to farm infinite or near-infinite triggers
And to be clear, this is for casual EDH only
Halo Fountain: Draw Card Every Turn Youve got to jump a few hoops to get there, but Halo Fountain is an unlikely white card that can provide recurring card draw each turn