Alhammarret, High Arbiter | Legendary Creature | Sphinx | Flying
As Alhammarret, High Arbiter enters the battlefield, each opponent reveals their hand. You choose the name of a nonland card revealed this way.
Your opponents can't cast spells with the chosen name (as long as this creature is on the battlefield). | Richard Wright
Gaea's Revenge | Creature | Elemental | This spell can't be countered.
Haste
Gaea's Revenge can't be the target of nongreen spells or abilities from nongreen sources. | Kekai Kotaki
Mage-Ring Responder | Artifact Creature | Golem | Mage-Ring Responder doesn't untap during your untap step.
{7}: Untap Mage-Ring Responder.
Whenever Mage-Ring Responder attacks, it deals 7 damage to target creature defending player controls. | Adam Paquette