Yes, that is also the main disadvantage to getting card advantage through drawing cards and yes, discard is also weakened by diminishing returns which card draw isn't, I am not comparing discard to card draw as a way towards card advantage, just stating the facts about cards in isolation
I generally prefer adding counters to gaining life as a +1, and Ajani, Adversary of Tyrantss -2 is a far more flexible than the one on Ajani, Strength of the Pride
Then return them to the battlefield under their owners control
Who Should Lead: Sauron or Saruman
We considered this within the structure of brackets and just regular pregame conversations
Once you reach the phase of the game where you can afford to do multiple things per turn, you need card draw to ensure you keep having things to do (Circle of Power, Fight On!, Travel the Overworld) or at least cards which can be used multiple times (flashback spells, Ring of the Lucii, Shambling Cieth, Relentless X-ATM092)