Throne of Bolas

At the begging of each opponents upkeep exile
target creature card from their graveyard with converted mana cost less than or equal to the
number of brick counters on Throne of Bolas.
At the begging of your end step put a brick
counter on Throne of Bolas.
''Fear not, Hapatra. Your death will be the slowest.''
-Nicol Bolas