Teshar, Ancestor's Apostle + Scrap Trawler + Lion's Eye Diamond + Altar of Dementia

Teshar, Ancestor's Apostle

Scrap Trawler

Lion's Eye Diamond

Altar of Dementia

How it works

1. Cast Lion's Eye Diamond by paying its mana cost.
2. Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
3. Activate Lion's Eye Diamond by discarding your hand and sacrificing it.
4. Activate Altar of Dementia by sacrificing Scrap Trawler.
5. When Scrap Trawler dies, it triggers, returning Lion's Eye Diamond from your graveyard to your hand.
6. Resolve the Altar of Dementia ability.
7. Repeat.

This elegant recycling loop centers around Teshar, Ancestor's Apostle, whose flying form triggers to pull Scrap Trawler back from the graveyard every time a historic spell is cast. With Altar of Dementia ready to sacrifice Scrap Trawler for graveyard-filling mill, Scrap Trawler's own ability triggers upon death to bounce Lion's Eye Diamond right back to your hand. You then crack that freshly returned Lion's Eye Diamond for three mana of any color by discarding your hand, using that exact mana to recast it as a historic spell—which restarts Teshar, Ancestor's Apostle's trigger all over again.