Mortal Obstinacy | Enchantment | Aura | Enchant creature you control
Enchanted creature gets +1/+1.
Whenever enchanted creature deals combat damage to a player, you may sacrifice Mortal Obstinacy. If you do, destroy target enchantment. | Slawomir Maniak
Oppressive Rays | Enchantment | Aura | Enchant creature
Enchanted creature can't attack or block unless its controller pays {3}.
Activated abilities of enchanted creature cost {3} more to activate. | Mark Zug