The second card was Up the Beanstalk, a throwaway uncommon from Wilds of Eldraine that was intended to support a limited archetype about casting expensive stuff but ended up being hilariously broken in just about every format it was legal in
If I skipped over one of your favorites, dont worry: I skipped over a massive number of my own as well
Agent of the Shadow Thieves plays quite well alongside blacks many ways to pay life for beneficial effect, making your commander(s) quite potent attackers against whoever is unfortunate enough to have the most life
These are two different creature types, and each can create interactions between cards
Stock Up is a blue sorcery spell that is basically a bigger version of Anticipate
Meanwhile, Up The Beanstalk was deemed too efficient a card-draw option, and it doesn't help that players don't have to pay 5 mana when they're using the Evoke elementals (at least Fury is gone now)