Edgar must be under your control in order to start casting an artifact spell using its first ability, but it doesn't need to stay under your control throughout that process or be under your control as the spell resolves
Yes, itd sure be great to pull that gold Mega Charizardit could pay for a vacationbut you most likely wont
Once per turn, during your Main Phase, send up to 3 cards from your hand to the Graveyard, and treat up to the number of "Crystal Beast" monsters with different names from your Deck to the Graveyard as Continuous Spell Cards and place them in the Spell/Trap Zone
Blade of Selves slots into almost any Commander deck that wants to attack
With the Offspring keyword, you can have twin Agates doubling the damage
Losing these three pivotal cards to rotation will be a significant blow to Yellow Big Mom Pirates leader strategies