If the opponent were to summon their own Master Peace, the True Dracoslaying King while Skill Drain is on field, then theirs would be negated
A card, usually in the form of a Continuous Monster Effect or Continuous Trap Card, that limits the actions of the opponent or both players
This triggers Sidisi, netting you another 2/2, triggering Path of Discovery, and so on
An impressively deep leaderboard system will also be launching sometime next month, tracking not just how you stack up against other players, but also ranking participants on things like how many prize cards they've taken
A deck focused on ramping up mana and controlling the board with creature-heavy strategy would benefit from using Aang, especially in a Bant (G W U) midrange or ramp deck
Answer: More ways to set up for Fusion Summoning