You may have Body Double enter the battlefield as a copy of any creature card in a graveyard.

Choose another player. Look at that player's hand and choose a card other than a basic land card from it. They discard that card. At the beginning of the first upkeep in your next game with that player, look at that player's hand and choose a card other than a basic land card from it. They discard that card.

Choose another player. You gain 5 life. At the beginning of the first upkeep in your next game with that player, you gain 5 life.

Flying

When Double Header enters the battlefield, you may return target permanent with a two-word name to its owner's hand.

Counter up to two target spells.

Choose another player. You draw two cards. At the beginning of the first upkeep in your next game with that player, you draw two cards.

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.

When you cast this spell, create a token that's a copy of it, except it isn't legendary.

: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact.

Paradox — Whenever you cast a spell from anywhere other than your hand, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

You may have Spark Double enter the battlefield as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary.

Assemble two Contraptions. (Put the top card of your Contraption deck face up onto one of your sprockets. Then repeat this process.)