Sure with all these examples the person gets a creature (or land) to replace the one they lost, but more often than not in EDH the creature you need to kill is either a 20/20 or some excellent utility creature creating a lot of problems for you
Specifically, I am going to be talking about the Battle Academy as well as the game as a whole
EX2-029 SR Digimon Lv.6 MegaGargomon Color Green Cost 12 DP 13000 Digivolve Cost 1 Green 5 from Lv.5 Form Mega Attribute Vaccine Type Machine Card Text 1 [Effect] [When Digivolving] For each green Tamer you have in play, suspend 1 of your opponent's Digimon
Eco-Conscious Materials: A growing segment prefers cases marketed as recyclable or made from eco-friendly acrylic
It fits perfectly in discard-focused shells alongside Rix Maadi Reveler or Waste Not, where every draw-and-discard cycle fuels the board and your resources
Each tapped creature can pay either 1 generic, or one mana that matches its color (to cover a colored symbol)