Since Earthcraft is tapping the creatures, mana dorks can become useful the turn they are played
Sprout Swarm is the most obvious, given it can Convoke future copies with the Saproling token made, but alongside something like a Storm-Kiln Artist or Birgi, God of Storytelling Horn of Bounty you go truly infinite
While it's not listed as a reward, based on the illustration contests the company has run in the past, we'd also be shocked if your art isn't stuck on a real life Pokmon card too
Something cool about this Top Ten
Aside from the cards you play, and the modal cards that appear in sets - which are just cards with multiple modes of casting - its hard to get a feel for that in Magic: The Gathering
I pulled basic lands for Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth to make these more likely