If you control a Treefolk, draw a card
Attacking Alone Outside the exalted mechanic, there are a fair number of other cards that have abilities tied to attacking alone
Layered onto all of this is a matter of timing: if you hit a red creature from either of these abilities, you still have to wait until the stack is empty to cast it
Najeela, the Blade-Blossom creates additional combat phases for each warrior that attacks, making this one of Commander's most explosive tribes
You can tap any two untapped artifacts you control to pay the cost of Shao Jun's last ability, including artifact creatures you haven't controlled continuously since the beginning of your most recent turn
If you want to be even techier, try out Night of Souls Betrayal, Urborg Shambler, or Stronghold Taskmaster