Willard, Fearless Delver

: When Willard, Fearless Delver enters the battlefield, investigate X. Then if X is four or greater, venture into the dungeon.
+1: The next time you venture into the dungeon this turn, the ability of the room you enter triggers an additional time.
-X: As an additional cost, sacrifice X Clue tokens. Venture into the dungeon X times. If you do not complete a dungeon this way, sacrifice Willard.