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It's not exactly ramp or card draw, yet it fulfills the purpose of both

Arch of Orazca seems like the most profitable way to gain advantage by having a lot of extra mana, but I could see playing a couple of small packages that combo well with Hour of Promise that allow you to do other things

They also fall into two different brackets of rarity

As an added bonus, if you manage to deal four direct damage to any opponent during your turn, you get to draw a card

Read the official announcement from WotC.

With very small draw power, this Trainer (not Supporter) might find a single spot in ones deck, especially if the deck featured many cards that reduced hand size