MAGIC: THE GATHERING
Whenever a creature an opponent controls dies, create a colorless Treasure artifact token with ", Sacrifice this artifact: Add one mana of any color to your mana pool."
At the beginning of your upkeep, if you control ten or more Treasures, you win the game.
If you like goofy alternate win conditions, Revel in Riches is the card for you! Pair it with Smothering Tithe for maximum value.