FlashFlash is a static ability that functions in any zone from which you could play the card it’s on. “Flash” means “You may play this card any time you could cast an instant.”
Multiple instances of flash on the same object are redundant. (CR 702.8)
All creatures have
shroudShroud is a static ability. “Shroud” means “This permanent or player can’t be the target of spells or abilities.”
Multiple instances of shroud on the same permanent or player are redundant. (CR 702.18). (They can't be the targets of spells or abilities.)
At the beginning of your upkeep,
sacrificeTo sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect this action. (CR 701.21) this artifact. When you do, target creature you control can't be blocked this turn.