You can let your chosen target attack another player and deal lethal damage to them, then cast Settle in the end of combat step, when those creatures are still considered attacking but after damage has been dealt, to take out two birds with one stone
Xenagos, God of Revels + Samut, Voice of Dissent There are some edge cases where these Gruul staples helm beast decks, but Xenagos, God of Revels and Samut, Voice of Dissent are mostly here to enable extra combat steps nonsense, so Id be wary of using these as face commanders for anything else
The best part is that none of these mechanics are unfamiliar to the existing playerbase at all and you have to commend the design team for their innovation
Thankfully, with Wilds of Eldraines Enchanting Tales containing powerful white reprints like Land Tax and Smothering Tithe, Moonshaker Cavalry should have all the support it needs to have maximum impact and regularly close out games
Rootha, Mastering the Moment Rootha, Mastering the Moment masters the moment by adding way more of them
