The deck lists for Mirrodin Besieged's Event Decks leaked a few weeks ago, but on Wednesday, Wizards revealed them in their Arcana section.
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"Into the Breach"
- Creatures (26)
- 2 Goblin Bushwhacker
- 2 Goblin Guide
- 4 Goblin Wardriver
- 1 Iron Myr
- 4 Kuldotha Rebirth
- 4 Memnite
- 4 Ornithopter
- 4 Signal Pest
- 1 Spikeshot Elder
- Spells (12)
- 2 Darksteel Axe
- 2 Devastating Summons
- 2 Galvanic Blast
- 4 Lightning Bolt
- 2 Panic Spellbomb
- Lands (22)
- 1 Contested War Zone
- 21 Mountain
- Sideboard (15)
- 2 Act of Treason
- 4 Goblin Ruinblaster
- 2 Into the Core
- 1 Leyline of Punishment
- 4 Searing Blaze
- 2 Unstable Footing
"Infect and Defile"
- Creatures (15)
- 4 Corpse Cur
- 1 Hand of the Praetors
- 4 Necropede
- 2 Phyrexian Vatmother
- 4 Plague Myr
- Spells (22)
- 2 Consuming Vapors
- 2 Contagion Clasp
- 4 Corrupted Conscience
- 2 Deprive
- 1 Doom Blade
- 4 Foresee
- 2 Mana Leak
- 3 Preordain
- 2 Smother
- Lands (23)
- 2 Drowned Catacomb
- 10 Island
- 4 Jwar Isle Refuge
- 7 Swamp
- Sideboard (15)
- 3 Deathmark
- 1 Doom Blade
- 3 Flashfreeze
- 2 Go for the Throat
- 4 Negate
- 2 Smother