Rule 141.1.b

While in the Trash:

• 141.1.b.1 Units are treated as Cards, similar to when in the Hand.
• 141.1.b.2 They retain the properties of being a Unit, but are not on the Board and thus cannot take actions or be affected by…
• 141.1.b.3 Units can be affected by spells and game effects that target Units in the Trash.

Official Core Rules