Can you even trash cards that doesnt have a trash cost?
As people have noted:
- All assets and upgrades have a trash cost.
- If a card lets you trash a card, unless it mentions a trash cost, then you can perform the trash even if it doesn't have a trash cost. Hence why Parasite, Edward Kim and Imp work.
It's also worth flagging that Drive By would work on an asset or upgrade that didn't have a trash cost if such a thing did exist (and it yet might! Although it does seem unlikely).