天上の調査員/Ethereal Investigator

Creature - Spirit
Flying <CR>
When Ethereal Investigator enters the battlefield, investigate X times, where X is the number of opponents you have. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") <CR>
Whenever you draw your second card each turn, create a 1/1 white Spirit creature token with flying.

Creature - Spirit
Flying <CR>
When Ethereal Investigator enters, investigate X times, where X is the number of opponents you have. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") <CR>
Whenever you draw your second card each turn, create a 1/1 white Spirit creature token with flying.

Creature - Spirit
Flying <CR>
When Ethereal Investigator enters the battlefield, investigate X times, where X is the number of opponents you have. (To investigate, create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.") <CR>
Whenever you draw your second card each turn, create a 1/1 white Spirit creature token with flying.

Creature - Spirit
Flying <CR>
When Ethereal Investigator enters the battlefield, investigate X times, where X is the number of opponents you have. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") <CR>
Whenever you draw your second card each turn, create a 1/1 white Spirit creature token with flying.