Zaszu, Operant Guile

Flash

When Zaszu enters play, you may return target
spell to its owner's hand. If you do, investigate X
times, where X is half that spell's mana value,
rounded down.

If you control four or more Clues, Zaszu can't be
blocked and has 'When this creature deals combat
damage to a player, you may sacrifice a Clue. If
you do, draw a card."