The Seventh Doctor (Serial Numbered) [Doctor Who] Elemental Knight return any number of target

return any number of target Aura and/or Equipment cards from your graveyard to the battlefield attached to enchanted creature

When Embercleave enters

Set: Foundations Type: Legendary Planeswalker — Chandra Rarity: Mythic Cost: {5}{R}{R} +2: Add {R}{R}{R}

you don't lose this mana as steps and phases end

The Seventh Doctor (Serial Numbered) [Doctor Who] Elemental Knight return any number of targetSet: 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: