Sensei's Divining Top on the battlefield or in your library.
All other permanents on the battlefield.
The Belligerent is a creature, does not have summoning sickness, and cannot be blocked and killed by an opponent.
Birds of Paradise does not have summoning sickness.
Steps
Declare The Belligerent as an attacker.
The Belligerent triggers, creating a Treasure token and allowing you to cast spells and play lands from the top of your library until end of turn.
Move to your postcombat main phase.
Activate Birds of Paradise by tapping it, adding ({1} magic symbol) .
Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
Cast Sensei's Divining Top from the top of your library by paying ({1} magic symbol) .
Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
Repeat from step 4.
Results
Infinite card draw.
Infinite draw triggers.
Near-infinite storm count.
Near-infinitely large Birds, Otters, Rats and Frogs you control until end of turn.
Near-infinite untap of Birds, Otters, Rats and Frogs you control.