FlyingFlying 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. (CR 702.9)
MeleeMelee is a triggered ability. “Melee” means “Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked with a creature this combat.”
If a creature has multiple instances of melee, each triggers separately. (CR 702.121) (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
LieutenantAn ability word has no rules meaning of its own. It groups abilities with similar themes; the text following it explains this card’s effect. (CR 207.2c) — As long as you control your
commanderA designated card for a Commander deck, governed by the command-zone, color-identity, and Commander rules. (CR 903), other creatures you control have
meleeMelee is a triggered ability. “Melee” means “Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked with a creature this combat.”
If a creature has multiple instances of melee, each triggers separately. (CR 702.121).