Mathar, Cosmic Cultivator

You have no maximum hand size
At the beginning of your upkeep
create a treasure token
You may draw one extra card on your draw step
if you control one or more treasure tokens
{t}{10} Sacrifice a treasure token target player
loses five life, discards three cards,
then exiles the top ten cards of his or her library
If at least five treasure tokens were spent to
activate this ability you gain ten life