Soul Rend Rarity: Uncommon TYPE: Instant SUBTYPE: - CMC: 2 Mana cost: USD: $0.36 EUR: 0.35 TIX: 1.03 EDHREC RANK: 29065 Destroy target creature if it's white
It will take a lot from Wizards to unseat Craterhoof Behemoth as the king of Green finishers

Academic Dispute Accelerate Acrobatic Maneuver Afflict Aggressive Urge Aleatory Aphotic Wisps Arcane Subtraction Arrester's Admonition Aura Finesse Auspicious Arrival Backslide Bandage Befuddle Bewilder Bladebrand Blindblast Blur Boiling Blood Bone Harvest Bone to Ash Broadside Barrage Carom Cerulean Wisps Chain Assassination Chaotic Strike Charge Through Chill of the Grave Chilling Trap Choking Tethers Code of Constraint Compleat Devotion Confront the Unknown Constricting Tendrils Consumed by Greed Courageous Resolve Crimson Wisps Crippling Chill Cunning Maneuver Cunning Strike Dark Dabbling Darkblast Death Pulse Decoy Gambit Decree of Savagery Deem Worthy Defiant Strike Deny Entry Depose // Deploy Depower Djeru's Resolve Dual-Sun Technique Easy Prey Ember Shot Enthusiastic Study Escape Detection Exclude Expedite Fateful Absence Fend Off Feral Instinct Fevered Strength Fire Prophecy Fires of Victory Fists of Flame Flare Flash Foliage Fleeting Distraction Footbottom Feast Force Away Formation

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Even if the Saheeli Rai has been on the battlefield a few turns and has enough loyalty to survive a Shock immediately, after the Guardian Flickers the Sahelli back onto the battlefield, it will no longer survive the Shock, which makes having access to the red instant at all times vital
Even with the combo potential in mind, the Nightmare Creature can get out of hand if your graveyard is big enough