Ashnod's Altar + Mardu Warshrieker + Nim Deathmantle
Ashnod's Altar
Mardu Warshrieker
Nim Deathmantle
Infinite black manaInfinite colorless manaInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite red manaInfinite creature sacrifice triggersInfinite white mana
How it works
Activate Ashnod's Altar by sacrificing Mardu Warshrieker, adding CC.
Nim Deathmantle triggers, causing you to pay 4 to return Mardu Warshrieker from your graveyard to the battlefield and attach Nim Deathmantle to it.
Mardu Warshrieker enters the battlefield, adding .