Silfas, Paranoid Theorist

Ward — {1}, discard a card
At the beginning of your upkeep, investigate.
Then target opponent reveals X cards from their
hand where X is the number of clues you control.
You may play a nonland card revealed this way if
its mana value is less than the number of clues
you control.
At the beginning of your end step you lose 1 life
for each clue you control.