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Mordekaiser + Circle of Death
S+ Tier Combo
Circle of Death deals 70% of heal as damage. Protein Shake amps shield/heal — Morde's W shield's heal-when-broken scales, dealing damage. Late, one W full-heal deletes squishies; W grants gray HP based on damage dealt, so with Executioner you can spam W forever. Never build Rift Maker or any omnivamp item — they override CoD damage. CoD deals magic damage — build magic pen. Enemy Serpent's Fang chunks your shield and damage.
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About Mordekaiser
About Circle of Death
Circle of Death
prismatic 50.65% WR
All Mordekaiser combos
View all Mordekaiser combos → 3 combos
More Circle of Death Combos
Maokai S Maokai's best augment. One auto = full health. 
Zac S Zac heals so frequently that Circle of Death procs constantly. 
Nunu & Willump S Q deals massive damage, but don't build Rod of Ages. Maokai S Protein Shake gives huge sustain — combined with Maokai's % HP regen passive, you never die. 
Vladimir S Vlad's Q and R heals each proc 5x Circle of Death damage — late-game team-wipe nukes. Do NOT build Rift Maker — its omnivamp interaction overrides Q's heal, killing the trigger. Zac S Use Circle of Death to convert massive heals into magic damage — pair with Zac's huge HP and % HP regen to play laser tower. Higher HP = bigger heal = bigger CoD damage; build HP and healing-boost hexes. 
Warwick S Warwick's auto and Q heals both proc 5x Circle of Death; Q has 100% AP scaling + % damage. Cast Q at half HP for max heal = max CoD damage. Nunu & Willump S CoD Nunu can deal massive damage to enemies via huge minion-Q heals. Avoid Rylai's — once you build it, Q on enemies stops dealing damage. Keep exploring
Mordekaiser + Circle of Death ARAM: Mayhem Combo Guide
This S+-tier combo pairs Mordekaiser with Circle of Death in ARAM: Mayhem. Generally not recommended — there are better options.
Circle of Death deals 70% of heal as damage. Protein Shake amps shield/heal — Morde's W shield's heal-when-broken scales, dealing damage. Late, one W full-heal deletes squishies; W grants gray HP based on damage dealt, so with Executioner you can spam W forever. Never build Rift Maker or any omnivamp item — they override CoD damage. CoD deals magic damage — build magic pen. Enemy Serpent's Fang chunks your shield and damage.