Declare enchanted creature as attacker.
Bear Umbra triggers, untapping all lands you control.
Proceed to your next main phase.
Activate Aggravated Assault by paying {3}{R}{R}, untapping all creatures you control and getting an additional combat and main phase after this one.
Repeat.

Infinite combat phases

Aggravated Assault

Bear Umbra

Declare Pako as attacker.
Pako and Bear Umbra triggers.
Resolve the Pako triggers, exiling the top card of each player's library and putting a fetch counter on each of them, putting a +1/+1 counter on Pako for each noncreature card exiled this way.
Resolve the Bear Umbra triggers, untapping all lands you control.
Proceed to your next main phase.
Activate Aggravated Assault by paying {3}{R}{R}, untapping all creatures you control and getting an additional combat and main phase after this one.
Repeat.

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