Sword of Fire and Ice A Curiosity saboteur effect with a Shock on top, and blue or red shenanigans just bounce off your creatures what's not to love
This set is chock full of retro frame cards and a mix of several Ravnica sets
This is well aided by a smattering of the more general countermagic too
Mangara, the Diplomat : A consistent card draw mechanic in white that either dissuades opponents' actions or rewards you with card draw
Some prime examples are the likes of Floriferous Vinewall or Gatecreeper Vine, the latter being my favorite one as its reliable and you could end up with a gate to fix your mana, like Black Dragon Gate or the game-changing Basilisk Gate
Then, you draw a card for each counter on it when it enters the battlefield, all but guaranteeing you get to refill your hand or even draw extra cards if you can load it up with enough counters