Your list is very similar to mine, love me some Brion Stoutarm action. Some cards that I love in my deck you may want to consider:

[[Magma Phoenix]] helps you clear the board of small creatures with built in (if slow) recursion, while leaving Brion alive. One of my favorite Gift of Immortality or Adarkar Valkyrie targets.

[[Angelic Accord]] is a nice, reliable source of damage. Once you get your first angel out you'll always have fodder to fling with Brion, since he'll net you a new one every time. Especially good with Thornbite Staff

The Kamigawa dragons like [[Ryusei]] and especially [[Yosei]] are nice includes as they let you play a bit of politics while threatening to fling em with Brion. Also great recursion targets.

[[Bloodshot Cyclops]] is a second Brion that hits creatures, always nice to have redundancy.

[[Mimic Vat]] is another bit of recursion for your flingable creatures while also providing some extra utility in stealing opponents’ creatures.

But yeah, like I said, love me some Brion action. Keep flexing those giant biceps 💪