He, like the two previous, also has flying but also has first strike which makes it so he does damage before the opposing creature (instead of at the same time) and gives him a slightly higher chance of survival (since he might not even get hit)
Scrying before card draw is always helpful, and its nice to get the option without paying any mana
Once the first triggered ability is on the stack, it won't trigger again, even if more damage is prevented and more incarnation counters are put onto it
Actually, given the popularity of DuplicantDuplicant in blink decks like Brago, King EternalBrago, King Eternal or Aminatou, the FateshifterAminatou, the Fateshifter, it's clear this enters-the-battlefield effect is pretty appealing to a ton of players out there
All the extra turn spells say, At the beginning of that turns end step, you lose the game. No worries, though