This is just an incredible black enchantment, allowing you to pay up to 6 life a turn for some combination of mana generation, card draw, and board presence
I'm not great at keeping track of triggers, but it's not unheard of for Faerie Mastermind to draw as many cards in a casual game's turn cycle as Mystic Remora or Rhystic Study
Thieves' Guild Enforcer While it was in Standard, Thieves' Guild Enforcer was a solid inclusion in rogue typal decks that aimed to kill your opponents in multiple ways
Opponents with decks whose curves extend to seven and play cards at random don't fear the Keg, they just respect it
Hraesvelgr of the First Brood Hraesvelgr of the First Brood is great combined with other big creatures
Some commanders might be great if you can generate infinite mana or combo it with a very expensive card, but Yuriko just wants cheap creatures and high-mana-value spells