First printed in Invasion (2000)
Mourning 
Enchantment — Aura
Enchant creature
Enchanted creature gets -2/-0.: Return this Aura to its owner's hand.
Combos
31 combos from Commander Spellbook, the most popular first.
- Near-infinite lifegain, Near-infinite lifeloss…: Helm of Awakening + K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight
- Near-infinite lifegain, Near-infinite lifeloss…: Jet Medallion + K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight
- Infinite +1/+1 counters on a creature, Infinite damage…: Aetherflux Reservoir + Helm of Awakening + K'rrik, Son of Yawgmoth + Mourning
- Near-infinite lifegain, Near-infinite lifeloss…: K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight + The Darkness Crystal
- Infinite +1/+1 counters on a creature, Infinite damage…: Aetherflux Reservoir + Cloud Key + K'rrik, Son of Yawgmoth + Mourning
- Near-infinite lifegain, Near-infinite lifeloss…: Cloud Key + K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight
- Near-infinite lifegain, Near-infinite lifeloss…: K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight + Semblance Anvil
- Near-infinite lifegain, Near-infinite lifeloss…: K'rrik, Son of Yawgmoth + Mana Matrix + Mourning + Pontiff of Blight
- Infinite +1/+1 counters on a creature, Infinite damage…: Aetherflux Reservoir + K'rrik, Son of Yawgmoth + Mana Matrix + Mourning
- Near-infinite lifegain, Near-infinite lifegain triggers…: K'rrik, Son of Yawgmoth + Mourning + Pontiff of Blight + Valeria Richards, Precocious
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Not legal
- Legacy Legal
- Vintage Legal
- Pauper Legal
- Future Standard Not legal
- Historic Not legal
- Timeless Not legal
- Alchemy Not legal
- Penny Dreadful Not legal
- Premodern Legal
- Old School 93/94 Not legal
Singleton
- Gladiator Not legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Legal
- PreDH Legal
- Tiny Leaders Legal
- Oathbreaker Legal
- Brawl Not legal
- Standard Brawl Not legal
- Competitive Brawl Not legal