It is a beast (no pun intended) that has multiple abilities, including card draw, that trigger whenever it attacks or blocks
Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.
There's basically no UW Legendary Knight to build around since your only choice is Tura Kennerd, Skyknight which actually cares about Soldiers and spellslinging, so your next options are either Rafiq of the Many or Galea, Kindler of Hope which are okay I guess
Just because you struggled with your first game, however, doesnt mean games two and three have to go the same way
Should the card successfully flip at least once before landing on the table, then any tokens the Chaos Orb touches are destroyed including the Chaos Orb itself