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.
Bastion of Remembrance's ability will trigger, dealing 1 damage to opponents and you'll gain 1 life.
Eloise will create another Clue token, which will die for being a 0/0 creature
The process will repeat itself infinitely, dealing infinite damage.