arra, guard of all

whenever a human creature enters the battlefield
under your control or dies, arra, guard of all gets
+1/+1 until end of turn and fights up to one
target nonhuman creature
whenever a non-human creature your opponent controls enters the battlefield or dies, you may tap
it and untap arra, guard of all.
tap target human creature you control: arra,
guard of all gets +1/+1 until end of turn