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
Flamespeaker's Will | Enchantment | Aura | Enchant creature you control
Enchanted creature gets +1/+1.
Whenever enchanted creature deals combat damage to a player, you may sacrifice Flamespeaker's Will. If you do, destroy target artifact. | Daniel Ljunggren
Font of Fertility | Enchantment | | {1}{G}, Sacrifice Font of Fertility: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. | Jack Wang