Weatherlight Compleated is hands down one of the best at dealing with those restrictions in its deck by synergizing extremely well with the cheap creature/ token generating options, having built in evasion, and a built in draw effect which is rather hard to find in colorless
Artifacts are a very popular archetype, but they are also historically colorless, so a four color general seemed like more of a hindrance in 2016, whereas the proliferation of colored artifacts following War of the Spark meant that Breya allowed you to take on new cards in ways that Bosh, Iron Golem and Memnarch would not have allowed
I'm not convinced stickers are worth the four mana you'll have to pay for them, but it's nice to get buffs along with them if you combine this with other sticker cards
Unlike most Yavimayan elves, Meria is fascinated by the ancient technology left behind by the Thran and doesn't hesitate to wield it in Yavimaya's defense
White Commons Spider-Man, Webslinger is somehow a 1-mana 3/3