You need at least one artifact token in play for this combo to work.
cast Titania's Song
Titania's Song transforms all noncreature artifacts into artifact creatures with power and toughness equal to their converted mana cost
When a creature dies, Pitiless Plunderer will create a Treasure token.
The Treasure Token will be a 0/0 creature and will die
This will trigger Pitiless Plunderer's ability again.
This loop will repeat infinitely, forcing a draw.