The Seventh Doctor (Showcase - Surge Foil) Finish:Foil create a token that's a

create a token that's a copy of target artifact you control

Then you may sacrifice a creature

If it's the first combat phase of your turn

and Helm of Kaldra have indestructible

exile it face down

The Seventh Doctor (Showcase - Surge Foil) Finish:Foil create a token that's aWhenever The Seventh Doctor attacks, choose a card in your hand. Defending player guesses whether that card's mana value is greater than the number of artifacts you control. If they guessed wrong, you may cast it without paying its mana cost. If you don't cast a spell this way, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")