Spiritomb A - Keystone Seal

[KazamBolt]

I would like to know exactly which types of cards that Keystone Seal doesn't allow to be played. By this, I mean:
Supporters
Trainers
Tools
Stadiums
Technical Machine
Fossil

Thanks in advance.

[PokePop]

Trainers.
Sub types of Trainers include Tools, Technical Machines, and Fossil cards.
"Trainer" is written in big text at the top of each one of these.

Older cards that were Supporters and Stadiums and used to say "Trainer" on them used to be an issue, but none of those are legal in Modified anymore except for some reprinted ones.
Supporters and Stadiums are not "Trainers".