Strong, the Brutish Thespian + Agatha's Soul Cauldron + Triskelion

Strong, the Brutish Thespian
Agatha's Soul Cauldron
Triskelion

Requires
Strong, the Brutish Thespian must be on the battlefield. Agatha's Soul Cauldron must be on the battlefield. Triskelion must be in exile (exiled by Agatha's Soul Cauldron). Strong has at least one +1/+1 counter on it.
Steps
  1. Activate Strong using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to Strong.
  2. Strong triggers, putting three +1/+1 counters on it and causing you to get three rad counters.
  3. Repeat an arbitrarily large number of times.
  4. Activate Strong using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  5. Repeat step 4 as desired.
Results
Infinite +1/+1 counters on Strong. Infinite damage. Infinite rad counters for yourself.

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High Synergy Cards
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80% of 5 decks +76% synergy
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Creatures
Yoshimaru, Ever Faithful
100% of 1 decks +99% synergy
Goblin Sharpshooter
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100% of 1 decks +92% synergy
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100% of 1 decks +89% synergy
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100% of 1 decks +81% synergy
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100% of 1 decks +79% synergy
Fathom Mage
75% of 4 decks +71% synergy
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75% of 4 decks +69% synergy
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60% of 5 decks +58% synergy
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60% of 5 decks +56% synergy
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60% of 5 decks +52% synergy
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50% of 4 decks +49% synergy
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50% of 4 decks +49% synergy
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50% of 4 decks +48% synergy
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50% of 4 decks +45% synergy
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50% of 4 decks +43% synergy
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40% of 5 decks +39% synergy
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40% of 5 decks +39% synergy
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40% of 5 decks +38% synergy
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40% of 5 decks +37% synergy
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40% of 5 decks +37% synergy
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40% of 5 decks +36% synergy
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40% of 5 decks +35% synergy
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40% of 5 decks +33% synergy
Evolution Sage
40% of 5 decks +33% synergy
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33% of 3 decks +32% synergy
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100% of 1 decks +89% synergy
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100% of 1 decks +82% synergy
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100% of 1 decks +37% synergy
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50% of 4 decks +32% synergy
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50% of 4 decks +29% synergy
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40% of 5 decks +32% synergy
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40% of 5 decks +22% 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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Mental Misstep
25% of 4 decks +19% synergy
Flusterstorm
25% of 4 decks +18% synergy
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25% of 4 decks +18% synergy
Reality Shift
25% of 4 decks +16% synergy
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25% of 4 decks +14% synergy
Mana Drain
25% of 4 decks +10% synergy
Swan Song
25% of 4 decks +9% synergy
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20% of 5 decks +20% synergy
Ultimate Price
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20% of 5 decks +9% synergy
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20% of 5 decks +6% synergy
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20% of 5 decks +4% synergy
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20% of 5 decks -10% synergy
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Underground Sea
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25% of 4 decks +10% synergy
Temple of Mystery
25% of 4 decks +8% synergy
Dreamroot Cascade
25% of 4 decks +6% synergy
Shipwreck Marsh
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Drowned Catacomb
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Morphic Pool
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Hinterland Harbor
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Sunken Hollow
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Thran Quarry
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Tarnished Citadel
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Plaza of Heroes
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Nurturing Peatland
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Mana Confluence
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Darkbore Pathway
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Twilight Mire
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Wooded Foothills
20% of 5 decks +10% synergy
Bloodstained Mire
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Arid Mesa
20% of 5 decks +9% synergy
Scalding Tarn
20% of 5 decks +9% synergy
Marsh Flats
20% of 5 decks +9% synergy
Deathcap Glade
20% of 5 decks +6% synergy
Path of Ancestry
20% of 5 decks -1% synergy