A 1st Edition card can be distinguished from an unlimited card by a small circular black stamp on the left (that says "Edition 1") below the character box on the front
The one innovation was that, while Innistrad only had DFCs that were a creature on both sides (and one planeswalker on both sides at mythic rare), Dark Ascension had two DFCs that started as artifacts, one of which wasn't even a creature on the back face
Magic Madhouse is well worth checking if you prefer online shopping, too
Unlike Calamity Bearer, it doesnt scale with Giants its the same whether you have one or five on the battlefield but the fact that it works from the graveyard can be quite strong
If you Enchant either Monolith, you can tap to add mana, then pay two less mana to untap the Monolith thanks to Power Artifact, tap for more mana, and repeat the process