Cyclonus and Aggravated Assault on the battlefield.
Cyclonus has power 5 or greater and does not have summoning sickness.
Permanents you control can tap to produce at least ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
An opponent cannot block Cyclonus.
Steps
Deal combat damage to an opponent using Cyclonus, the Saboteur.
Cyclonus triggers, causing it to connive and convert it to Cyclonus, Cybertronian Fighter.
Move to your postcombat main phase.
Activate any number of permanents you control by tapping them, adding at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Move to your next combat phase, and deal combat damage to an opponent using Cyclonus, Cybertronian Fighter.
Cyclonus triggers, causing you to convert it to Cyclonus, the Saboteur and to get an additional beginning phase after this one.
Move to your beginning phase, causing you to untap all permanents you control.
Move to your postcombat main phase.
Activate any number of permanents you control by tapping them, adding at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Move to your next combat phase.
Repeat.
Results
Infinite card draw.
Infinite draw triggers.
Near-infinite +1/+1 counters on Cyclonus.
Near-infinite combat damage.
Near-infinite combat phases.
Near-infinite self-discard triggers.
Near-infinite untap of permanents you control.
Near-infinite mana permanents you control can produce.