Autumn Willow and Baron Sengir

Flying is an evasion ability.

A creature with flying can’t be blocked except by creatures with flying and/or reach. A creature with flying can block a creature with or without flying. (See rule 509, “Declare Blockers Step,” and rule 702.17, “Reach.”)

Multiple instances of flying on the same creature are redundant.

Shroud 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.