card draw green mtg White Still Needs More (And It's Not Why You Think) Card draw in green? :

Designed by Dan Frazier, the Mox series was intentionally crafted to be instantly recognizable, with each gemstone representing its respective color of Magic mana

As for their origins, thats where the mystery deepens

Its very easy to build a spellslinger deck around Arclight Phoenixs ability

Delirium If there are four or more card types among cards in your graveyard, instead search your library for any card, put it into your hand, then shuffle

Thinking it was just a Looter and a worse version of Anje Falkenrath

Giving up some blocking ability to get a third point of toughness tends to be a bad deal, but I think the opposite is true in Kaladesh