Pentimento

Whenever an enchantment enters the battlefield, put
a Hex counter on Pentimento. As long as there are
-1+ counters, spells your opponents cast cost {1} more to cast.
-2+ counters, creatures your opponents control
enter the battlefield tapped.
-3+ counters, creatures your opponents control
gain -0/-1.
-4+ counters, opponents can only cast one spell
per turn.
-5+ counters, enchantments you control gain Hexproof.