As written, exhaust abilities are abilities that can only be activated once per game, meaning once they are used, that's it, unless the card is recast at a later point in the game
Its far less impressive with merfolk, goblins, and other generally cheap creature types
(Mox Lotus could already accomplish this.) Can I create tokens
And while Tracker does have a +1/+1 counter ability for every time you sacrifice a Clue, I don't think that's really making up the difference
For weeks Ive been parading around boasting about how well my Grixis Control decklist matched up against G/R Aggro, a point which I would still defendin a general sense The problem was that I was woefully unprepared for a particular sideboard card: Wouldnt you know it, I found myself playing my bubble match in round 9 against G/R, and when he led with a Birds of Paradise and a Sword of War and Peace I knew it was time to put my money where my mouth was
The Grand Calcutron's ability overrides X in this case