Produces: a Berserker, Demon, creature or token being created, a Berserker, Demon, creature or token entering the battlefield, a card being drawn, life being lost.
Cares about: nothing.
Partners
28 cards can cause a Demon entering the battlefield.
Blood Speaker — When a Demon enters thanks to The Bloodsky Massacre, Blood Speaker brings a card back
Be'lakor, the Dark Master — When a Demon enters thanks to The Bloodsky Massacre, Be'lakor, the Dark Master deals its power damage
2,615 cards can cause a creature token being created.
Staff of the Storyteller — When The Bloodsky Massacre makes a Demon token, Staff of the Storyteller puts counters on a permanent
2,615 cards can cause a creature token entering the battlefield.
Anointer Priest — When a Demon enters thanks to The Bloodsky Massacre, Anointer Priest gains you 1 life
Securitron Squadron — When a Demon enters thanks to The Bloodsky Massacre, Securitron Squadron puts counters on a permanent
Nesting Dovehawk — When a Demon enters thanks to The Bloodsky Massacre, Nesting Dovehawk puts counters on a permanent
2,685 cards can cause life being lost.
Wax-Wane Witness — When The Bloodsky Massacre makes a player lose life, Wax-Wane Witness gives +1/+0
Gonti's Machinations — When The Bloodsky Massacre makes a player lose life, Gonti's Machinations triggers
Lich's Tomb — When The Bloodsky Massacre makes a player lose life, Lich's Tomb triggers
3,431 cards can cause a card being drawn.
Aether Syphon — When The Bloodsky Massacre draws a card, Aether Syphon mills a card
Moonring Mirror — When The Bloodsky Massacre draws a card, Moonring Mirror triggers
Lat-Nam Adept — When The Bloodsky Massacre draws a card, Lat-Nam Adept puts a counter on a permanent
3,521 cards can cause a token being created.
Diregraf Horde — When The Bloodsky Massacre makes a Demon token, Diregraf Horde hits a graveyard
EDH Seer reads the oracle text of every card in a Commander decklist and reports which pairs
actually work together, with the reason printed next to each one.
34,433
cards in the corpus, 21,317 of them read in full
~495
synergy edges in an average Commander deck
0
model calls when you analyse a deck
What an edge is, and what it is not
Krenko, Mob Bossproduces
enters · creature · token
Impact Tremorscares about
Edge. When a creature enters thanks to Krenko, Mob Boss, Impact Tremors deals 1 damage.
Farseekproduces
enters · land
Enduring Couragecares about
No edge. It wants a creature entering, and a fetched land is not one.
What it refuses to claim
Ramp, removal and card draw are roles, not synergies — they make a deck work
without pairing with anything, so they are counted as slots rather than drawn as edges. A
card that refers to itself ("this creature", "this spell") is read as itself and not as a
class. Where the rules cannot say something, the report says nothing: a missing claim is
better than a confident wrong one.