The first are Landers, which had a huge presence in the set and are likely going to become just as ubiquitous as Food
Tyvar the Bellicose This legendary Golgari Elf Warrior hails from the despised March of the Machine: The Aftermath set, which sees a desparked Tyvar turn into an excellent mana dork lord, especially for Elves
Planeswalkers like Saheeli, Sublime Artificer are particularly synergistic with Vadrok, Apex of Thunder, as they can create creatures that Vadrok can later mutate into, even if the planeswalker is removed
Six mana may be a lot, but artifact decks often have ways to create a lot of it pretty easily
Deathtouch is a very helpful keyword to have on a creature in the early game, and the ability to look at the top of your library and play lands and spells (with mana value 4 or greater) from the top of your library is pretty sweet