Seasons Past: definitely reads mythic, and in a deck with good graveyard seeding and a well-designed mana curve, you should be able to get a full hand of cards out of your graveyard
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Similarly, if you sacrifice an artifact to activate a mana ability while casting a spell with improvise, that artifact won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for improvise
Naturally, both nonlegendary and legendary artifact creatures fit this bill
The Holo Mismatch Trap Scammers constantly mix up the foil types, know your patterns, RED FLAG: If you see an English Wizards card with a Speckle pattern, or a repeating identical pattern matching another card online, it is 100% counterfeit