You need a way to stop the loop or the game will end in a draw.
With all cards in play, sacrifice a creature
Eloise's ability will trigger, create a Clue token
The token will be a 0/0 creature due to March of the Machines and will die.
Crowded Crypt's ability will trigger, put a counter on it.
Eloise will create another Clue token, which will die for being a 0/0 creature
The process will repeat itself endlessly until you stop the loop.
When stopping the loop, sacrifice Crowded Crypt to create 2/2 infinite tokens.