Ghostly Prison

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Phyrexian Unlife

You don't lose the game for having 0 or less life.
As long as you have 0 or less life, all damage is dealt to you as though its source had infect. (Damage is dealt to you in the form of poison counters.)

Damping Matrix

Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.

Zur the Enchanter

Flying
Whenever Zur the Enchanter attacks, you may search your library for an enchantment card with mana value 3 or less, put it onto the battlefield, then shuffle.

Propaganda

Suppression Field

Activated abilities cost {2} more to activate unless they're mana abilities.

Solemnity

Players can't get counters.
Counters can't be put on artifacts, creatures, enchantments, or lands.