One of the obvious additions consider that is Relic of Legends, possibly Inga and Esika (though they're not LotR) and We Ride at Dawn
If either creature is an illegal target as Beastie Beatdown tries to resolve, the creature you control won't deal damage
Every hit marks the map of your defeat
While several of the support Creatures included above can help with this, these non-Creature cards are integral in getting your attackers loaded up with gear as quickly as possible: Sigardas Aid Forge Anew Hammer of Nazahn Battlefield Improvisation Removal Playing in Esper colors gives Arna Kennerd access to a good variety of spot removal and board wipes
Blink spells make a commander leave, then return to the battlefield, which means a blink deck with Candlekeep Sage will draw two cards every time it flickers its commander
Well, aside from the ways weve discussed in moderation, of course try to consider playing more creatures with flash, for instance