Secrets of the Key

1, T, Sacrifice this artifact: Exile up to one target card from a graveyard. Draw a card. 1, Exile this card from your graveyard: Add one mana of any color.

Flying Whenever you cast a noncreature spell, create an X/X red Dragon Illusion creature token with flying and haste, where X is the amount of mana spent to cast that spell. Exile that token at the beginning of the next end step.

When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.) When this creature dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

Flying This creature can't block.

Cleave 3UU (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.) Draw three cards. [Your maximum hand size is reduced by three for the rest of the game.]

Enchant creature When this Aura enters, mill two cards. (Put the top two cards of your library into your graveyard.) Enchanted creature gets -X/-0, where X is the number of cards in your graveyard.

Target player loses 2 life and you gain 2 life. Create two Blood tokens. (They're artifacts with "1, T, Discard a card, Sacrifice this token: Draw a card.")

Other tapped creatures you control have deathtouch. Other untapped creatures you control have hexproof. 1, T: Untap another target creature or land you control.