Try this for Battlerouse--split the ability. This should give you what you're aiming for.
Multikicker (cost):Add a +1/+1 counter to another target creature.
Battlerouse (Whenever this creature attacks or blocks, untap all creatures with +1/+1 counters on them. Add another declare attackers step and another declare blockers step after this one. All creatures with +1/+1 counters on them must attack or block this turn if able.)
Multikicker (cost):Add a +1/+1 counter to another target creature.
Battlerouse (Whenever this creature attacks or blocks, untap all creatures with +1/+1 counters on them. Add another declare attackers step and another declare blockers step after this one. All creatures with +1/+1 counters on them must attack or block this turn if able.)