Ever since Death's Shadow had its breakout performances in Modern, people have been exploring the strategy in Legacy. Death's Shadow provides another Delver of Secrets-esque threat - enormously efficient and threatening for its mana cost, particularly when backed up by cheap and free disruption. At the Pro Tour, we finally saw Death's Shadow putting up Legacy results on Magic's biggest stage:

Grixis Death's Shadow | Legacy | weezy, 15th Place Legacy Challenge

• Creatures (14)
• 2 Gurmag Angler
• 4 Death's Shadow
• 4 Delver of Secrets
• 4 Street Wraith

• Instants (22)
• 1 Dismember
• 1 Kolaghan's Command
• 1 Stubborn Denial
• 3 Stifle
• 4 Brainstorm
• 4 Daze
• 4 Force of Will
• 4 Lightning Bolt

• Sorceries (6)
• 2 Thoughtseize
• 4 Ponder

• Lands (18)
• 1 Blood Crypt
• 1 Bloodstained Mire
• 1 Steam Vents
• 1 Underground Sea
• 1 Volcanic Island
• 2 Watery Grave
• 3 Scalding Tarn
• 4 Polluted Delta
• 4 Wasteland

• Sideboard (15)
• 1 Blue Elemental Blast
• 1 Diabolic Edict
• 2 Dread of Night
• 1 Faerie Macabre
• 1 Flusterstorm
• 1 Hymn to Tourach
• 1 Kolaghan's Command
• 1 Liliana, the Last Hope
• 1 Marsh Casualties
• 2 Pyroblast
• 1 Stubborn Denial
• 2 Surgical Extraction

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Delver of Secrets plus cantrips, Daze, and Force of Will is a tried and true strategy in Legacy, particularly in the absence of Deathrite Shaman. Stifle and Wasteland help you prevent your opponents from developing their mana. Like all Delver of Secrets decks, your goal is to play a resource-light game while you chip in for damage with your Delvers and Death's Shadows. The advantage of Death's Shadow as a threat is that you gain access to Stubborn Denial if you are interested in playing it.

Some builds of this deck have stuck to, featuring a high density of Thoughtseizes and Inquisition of Kozileks as well as Reanimate so that you can rebuy Death's Shadows or Street Wraiths as another cheap threat.

The key difference provided by the Red splash is access to Lightning Bolt in the maindeck as an additional form of interaction and reach. Additionally, you gain access to Red Elemental Blast and Pyroblast as ways to gain edges in Blue mirrors. If you're looking for a new take on Blue tempo decks in Legacy, this seems like it could be a great choice. Your deck is weak against Swords to Plowshares decks, since they can undo so much of your work to reduce your life total. That said, your threats quickly trump traditional Delver threats like Gurmag Angler, Tarmogoyf, and Nimble Mongoose.