Just to let everyone know you can use Goblin Circus to banish Paleozoics . Then use Paleozoic Leanchoilia to send them to the graveyard and activate there effects.
No: face-down means the identity is unknown (despite being allowed to see your own face-down banished cards), so a card such as Escape From the Dark Dimension can't determine if it's a DARK monster.
Continued: if a card allows you to take ANY banished card though, you would be allowed to use that, such as Primal Seed. But any kind of restriction, such as "a monster", and a card won't work on a face-down banished card (hence, nothing that Special Summons works on a face-down banished card).
1) No because face-down cards don't have properties like monster, Spell, or Trap.
2) It's not called the banish zone. They're just cards that are banished.
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