All of the steps Oath says to take (including the "may" decision) are part of one resolving triggered ability, and no player may take any voluntary actions while a spell or ability is resolving
Nowadays, we take this luxury for granted, and even look for ways to extract additional value from these types of cards in a variety of constructed formats, including Commander
Unlike Mickey and Hercules, Arthur's card embraces bright colors of blue, green, and yellow to help the boy king pop out from his background
So now, the converted mana cost question is simple: if Destined to Lead isn't on the stack, it has a converted mana cost of 6
To the air he had returned, bringing ruin, turning hope to despair, and victory to death
Anytime you attack one of your attacking creatures connives for the number of attacking creatures