```ruby
BanList.for_format("custom standard") do
  change(
    "2017-06-27",
    nil,
    "Dreamheart Mox" => "banned",
  )
end
```

Add Reev, Equinox Prophet to Custom Standard banlist
user
```ruby
BanList.for_format("custom standard") do
  change(
    "2017-06-27",
    nil,
    "Dreamheart Mox" => "banned",
  )

  change(
    "2017-12-15",
    nil,
    "Reev, Equinox Prophet" => "banned",
  )
end
```
assistant