Space Fungus Snickerdoodle

Skulk is an evasion ability.

A creature with skulk can’t be blocked by creatures with greater power. (See rule 509, “Declare Blockers Step.”)

Multiple instances of skulk on the same creature are redundant.

Battle cry is a triggered ability. “Battle cry” means “Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.”

If a creature has multiple instances of battle cry, each triggers separately.