Valakut Exploration does require you to play lands in order to work, but thats a small price to pay for a three-mana draw engine in a format littered with four-mana cards like Chandra, Torch of Defiance, Outpost Siege, and more
Oath of Druids, Rare Oath of Druids was a key factor in the game, both then, and now, and has made an appearance in multiple formats, such as Legacy and even Vintage
Animal Kingdom Pirates Illustrated by NIJIMAARC Block 2 Standard legal Extra legal
Apparently, Eureka up above in Green isn't the only Einstein reference here, because the dude shows up in Presence of the Master here
Treasure Map can have a more rapid and swingy impact than most of the the other flip land cards from the block due to the potential mana influx and that is surprisingly powerful given how slow it seems on paper
White aggro decks dont want removal that creatures a speedbump, while slower decks give the opponent time to regain value from the creature