Aldo, Divine Channeler

Lifelink
Whenever one or more spirits you control deal
combat damage to a player you may sacrifice any
number of clues. If you do, look at target player's
hand. You may cast a creature spell in it with
mana value X or less, where X is the number of
clues sacrificed this way. You may spend mana
of any color to cast it. It becomes a spirit in
addition to its other types.
Sacrifice a spirit: Investigate.