Shalai and Hallar + Devoted Druid + Arcus Acolyte + Primal Vigor

Shalai and Hallar
Devoted Druid
Arcus Acolyte
Primal Vigor

Requires
Shalai and Hallar must be on the battlefield. Devoted Druid must be on the battlefield. Arcus Acolyte must be on the battlefield. Primal Vigor must be on the battlefield. Devoted Druid does not have summoning sickness and does not have a -1/-1 counter on it.
Steps
  1. Activate Devoted Druid's first ability by tapping it, adding .
  2. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
  3. If Devoted Druid has a +1/+1 counter on it, repeat from step 1 until Devoted Druid has no +1/+1 counters.
  4. Activate Devoted Druid's outlast ability by paying and tapping it, putting two +1/+1 counters on Devoted Druid.
  5. Shalai and Hallar triggers, dealing 2 damage to an opponent.
  6. Repeat from step 2.
Results
Infinite damage.

Shalai and Hallar
0.03% of 8949 decks 3 decks
Marath, Will of the Wild
0.04% of 2413 decks 1 decks
High Synergy Cards
Conclave Mentor
100% of 4 decks +93% synergy
Hardened Scales
100% of 4 decks +91% synergy
Kami of Whispered Hopes
100% of 4 decks +91% synergy
Creatures
Elenda's Hierophant
100% of 1 decks +100% synergy
Ojer Axonil, Deepest Might
100% of 1 decks +99% synergy
Dauntless Dismantler
100% of 1 decks +98% synergy
Gyre Sage
75% of 4 decks +66% synergy
Delighted Halfling
67% of 3 decks +56% synergy
Ageless Entity
50% of 4 decks +50% synergy
Iridescent Hornbeetle
50% of 4 decks +50% synergy
Archangel of Thune
50% of 4 decks +49% synergy
War Elemental
50% of 4 decks +49% synergy
Ivy Lane Denizen
50% of 4 decks +48% synergy
Walking Ballista
50% of 4 decks +48% synergy
Herd Baloth
50% of 4 decks +48% synergy
Heliod, Sun-Crowned
50% of 4 decks +47% synergy
Vigor
50% of 4 decks +47% synergy
Scurry Oak
50% of 4 decks +47% synergy
The Red Terror
50% of 4 decks +47% synergy
Good-Fortune Unicorn
50% of 4 decks +46% synergy
Hamza, Guardian of Arashin
50% of 4 decks +46% synergy
Mikaeus, the Lunarch
50% of 4 decks +46% synergy
Halana and Alena, Partners
50% of 4 decks +45% synergy
Forgotten Ancient
50% of 4 decks +44% synergy
Incubation Druid
50% of 4 decks +40% synergy
Champion of Lambholt
50% of 4 decks +37% synergy
Agatha of the Vile Cauldron
33% of 3 decks +33% synergy
Bright-Palm, Soul Awakener
33% of 3 decks +30% synergy
Arwen, Weaver of Hope
33% of 3 decks +28% synergy
Rosie Cotton of South Lane
33% of 3 decks +26% synergy
Aerie Ouphes
25% of 4 decks +25% synergy
Drillworks Mole
25% of 4 decks +25% synergy
Gideon's Avenger
25% of 4 decks +25% synergy
Ollenbock Escort
25% of 4 decks +25% synergy
Gideon's Company
25% of 4 decks +25% synergy
Weaver of Blossoms
25% of 4 decks +25% synergy
Mayor of Avabruck
25% of 4 decks +25% synergy
Twinblade Paladin
25% of 4 decks +25% synergy
Kitchen Finks
25% of 4 decks +25% synergy
Basri's Lieutenant
25% of 4 decks +25% synergy
Magus of the Order
25% of 4 decks +25% synergy
Ochre Jelly
25% of 4 decks +25% synergy
Fearless Pup
25% of 4 decks +25% synergy
Hungry Ridgewolf
25% of 4 decks +25% synergy
Celestial Unicorn
25% of 4 decks +25% synergy
Tundra Wolves
25% of 4 decks +25% synergy
Serra Redeemer
25% of 4 decks +25% synergy
Victory's Envoy
25% of 4 decks +25% synergy
Young Wolf
25% of 4 decks +25% synergy
Marath, Will of the Wild
25% of 4 decks +25% synergy
Voice of the Blessed
25% of 4 decks +25% synergy
Huntmaster of the Fells
25% of 4 decks +25% synergy
Wolfir Silverheart
25% of 4 decks +25% synergy
Instants
Chord of Calling
50% of 4 decks +43% synergy
Inspiring Call
50% of 4 decks +39% synergy
Eladamri's Call
50% of 4 decks +38% synergy
Chaos Warp
50% of 4 decks +32% synergy
Path to Exile
50% of 4 decks -2% synergy
Stroke of Midnight
33% of 3 decks +23% synergy
Sure Strike
25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
Summoner's Pact
25% of 4 decks +25% synergy
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25% of 4 decks +23% synergy
Snakeskin Veil
25% of 4 decks +23% synergy
Abrade
25% of 4 decks +21% synergy
Silence
25% of 4 decks +21% synergy
Congregation at Dawn
25% of 4 decks +21% synergy
Naya Charm
25% of 4 decks +13% synergy
Enlightened Tutor
25% of 4 decks +12% synergy
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25% of 4 decks +10% synergy
Boros Charm
25% of 4 decks -4% synergy
Heroic Intervention
25% of 4 decks -14% synergy
Swords to Plowshares
25% of 4 decks -35% synergy
Sorceries
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75% of 4 decks +21% synergy
Three Visits
50% of 4 decks +21% synergy
Nature's Lore
50% of 4 decks +12% synergy
Rampant Growth
50% of 4 decks +10% synergy
Farseek
50% of 4 decks -0% synergy
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25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
Threats Undetected
25% of 4 decks +25% synergy
Heat Shimmer
25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +23% synergy
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25% of 4 decks +23% synergy
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25% of 4 decks +21% synergy
Eldritch Evolution
25% of 4 decks +21% synergy
Damning Verdict
25% of 4 decks +20% synergy
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25% of 4 decks +16% synergy
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25% of 4 decks +13% synergy
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25% of 4 decks +8% synergy
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Ozolith, the Shattered Spire
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Animation Module
25% of 4 decks +25% synergy
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Darksteel Plate
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25% of 4 decks +23% synergy
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25% of 4 decks +18% synergy
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Court of Garenbrig
100% of 2 decks +97% synergy
Uncivil Unrest
75% of 4 decks +69% synergy
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75% of 4 decks +68% synergy
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75% of 4 decks +41% synergy
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50% of 4 decks +47% synergy
Virtue of Loyalty
50% of 2 decks +47% synergy
Cathars' Crusade
50% of 4 decks +42% synergy
Pandemonium
25% of 4 decks +25% synergy
Lifelink
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25% of 4 decks +25% synergy
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25% of 4 decks +25% synergy
Swift Reconfiguration
25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +24% synergy
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25% of 4 decks +23% synergy
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25% of 4 decks +23% synergy
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25% of 4 decks +23% synergy
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25% of 4 decks +22% synergy
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25% of 4 decks +20% synergy
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25% of 4 decks +16% synergy
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25% of 4 decks +5% synergy
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25% of 4 decks +24% synergy
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Lands
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25% of 4 decks +24% synergy
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25% of 4 decks +23% synergy
Ash Barrens
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25% of 4 decks +19% synergy
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Battlefield Forge
25% of 4 decks +7% synergy
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25% of 4 decks +2% synergy
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25% of 4 decks -5% synergy
Evolving Wilds
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25% of 4 decks -7% synergy
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25% of 4 decks -21% synergy
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25% of 4 decks -24% synergy
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25% of 4 decks -32% synergy