Beledros Witherbloom + Urza's Saga + Agatha's Soul Cauldron + Arwen, Weaver of Hope + Angelic Chorus

Beledros Witherbloom

Urza's Saga

Agatha's Soul Cauldron

Arwen, Weaver of Hope

Angelic Chorus

How it works

1. Activate any number of lands except Urza's Saga by tapping them, adding at least 2.
2. Activate Urza's Saga's second ability by paying 2 and tapping it, creating a 0/0 Construct artifact creature token that gets +1/+1 for each artifact you control, and that enters the battlefield with a number of +1/+1 counters equal to Arwen's toughness.
3. When the Construct enters the battlefield, Angelic Chorus triggers, causing you to gain at least 10 life.
4. Activate the Construct using Beledros Witherbloom's ability by paying 10 life, untapping all lands you control.
5. Repeat.
6. If other lands you control can tap to produce at least 3, this combo nets infinite mana.

This intricate loop relies on Urza's Saga to continually generate Construct tokens, which enter the battlefield with massive stats thanks to Arwen, Weaver of Hope boosting them with additional +1/+1 counters. Each time a Construct arrives, Angelic Chorus turns its arrival into a massive life injection, giving you the cushion you need to pay Beledros Witherbloom's steep 10-life cost and untap all your lands. Meanwhile, Agatha's Soul Cauldron weaves its magic across your board, ensuring all your pieces synergize fluidly to fuel this engine. By cycling your mana into Urza's Saga and using Beledros Witherbloom to reset your lands every iteration, you ultimately achieve an endless cascade of lifegain, tokens, and untaps.