Nim Deathmantle + Ashnod's Altar + Urza, Lord High Artificer
Nim Deathmantle
Ashnod's Altar
Urza, Lord High Artificer
Infinite blue manaInfinite colorless manaInfinite creature tokensInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersExile your libraryCast all spells in your libraryInfinite creature tokens that are infinitely large
How it works
Activate Ashnod's Altar by sacrificing Urza, adding CC.
When Urza dies, Nim Deathmantle triggers, causing you to pay 4 to return Urza from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Urza enters, it triggers, creating a creature token.
Activate Ashnod's Altar by sacrificing a creature token, adding CC.