Once Brotherhood Spy's ability has resolved, removing the legendary Assassin (or Assassins) you control from the battlefield or causing them to lose the legendary supertype or Assassin subtype won't cause Brotherhood Spy's ability to stop applying for that turn
Being able to cast two spells a turn should be achievable in most decks, and regardless of whether youre ramping into an expensive or early commander, youll want to be playing some amount of ramp to make this happen
As above, first strike and double strike only work during the combat step
(6/6/2025) Traveling Chocobo's ability doesn't copy the triggered ability
Cleopatra, Exiled Pharaoh If you want to merge +1/+1 counters with the potential for a group hug strategy and a desire to sacrifice legendary creatures, look no further than Cleopatra, Exiled Pharaoh
Even today, this card's powers are impressive