The Water Crystal isnt quite as strong, but it might be good enough for Pioneer in particular
Black Arnyn, Deathbloom Botanist Saffgor: It blocks decently, and most decks that want an effect like this are already aiming to churn through 1/1s, so Arnyn seems solid in the 99
For all your singleton questions, catch him streaming at twitch.tv/benjamin_wheeler or ask away at @BWheelerMTG.
I'd like haste in this color to push to the Top Five, but it's still good at casual play just based on size and abilities and upkeep trigger
You may notice that most of these cards are all from the same print run
Both Foundations and Tarkir: Dragonstorm were lauded for how much they felt like sets of old, diving into the qualities that are quintessentially Magic