You can use that prior to swinging and take out tapped things so that they cannot attack back or post combat and swinging and tapping out with your Knights to destroy the untapped stuff
The game plan here is simple: use cheap but powerful burn spells and efficient creatures to kill the opponent before they ever really get a chance to get going
As you probably know, before my game fell apart I was running a Ravenloft game and it just so happens that the most recent set of Magic cards: Innistrad, was becoming a rather large piece of inspiration for setting up my game, especially the monsters (see my Grave Titan)
It saw a lot of use in Standard burn decks, but it can still be useful in any mono-red Commander build due to its quick and easy mana production
The setting of Ixalan also takes inspiration from real-life cultures that I wanted to learn about for this piece
Normally, cleave lets you pay a different cost to remove the bracketed text from a card