The Seventh Doctor (Serial Numbered) [Doctor Who] Sloth Mutant sacrifice this artifact unless you

sacrifice this artifact unless you pay {2}

and you may play lands and cast creature and enchantment spells from the top of your library

you may sacrifice any number of creatures

you may put target creature card from that player's graveyard onto the battlefield under your control

Set: The List Type: Instant Rarity: Uncommon Cost: {1}{U} Target player mills three cards

The Seventh Doctor (Serial Numbered) [Doctor Who] Sloth Mutant sacrifice this artifact unless youSet: Doctor Who Type: Legendary Creature Time Lord Doctor Rarity: Rare Cost: {3}{W}{U} Whenever 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 artifact: