Choose target creature you control and target creature an opponent controls. Put a +1/+1 counter on the creature you control if it has power 4 or greater. Then those creatures fight each other. (Each deals damage equal to its power to the other.)

Enchant creature

When this Aura enters, put a +1/+1 counter on enchanted creature.

Whenever enchanted creature attacks, double the number of +1/+1 counters on it.

Create a 1/1 white Ally creature token. Put a +1/+1 counter on it for each creature your opponents control.

Trample (This creature can deal excess combat damage to the player it's attacking.)

Whenever this creature attacks, another target creature you control gets +2/+2 and gains trample until end of turn.