Brallin, Skyshark Rider

If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities. If Haldan and Pako are your commanders, your deck may contain cards with blue, red, and/or green in their color identity, but not cards with white or black.

Brallin's middle ability gives it only one +1/+1 counter each time it resolves, no matter how many opponents are dealt damage.

Brallin's middle ability deals 1 damage to each opponent even if you can't put a +1/+1 counter on Brallin, most likely because Brallin has left the battlefield.