Beledros Witherbloom + Urza's Saga + Agatha's Soul Cauldron + Arwen, Weaver of Hope + Diamond Valley

Beledros Witherbloom

Urza's Saga

Agatha's Soul Cauldron

Arwen, Weaver of Hope

Diamond Valley

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. Activate the Construct using Beledros Witherbloom's ability by paying 10 life, untapping all lands you control.
4. Activate Diamond Valley by tapping it and sacrificing the Construct, causing you to gain at least 10 life.
5. Repeat.
6. If the number of artifacts you control plus Arwen's toughness is equal to or greater than 10, this combo nets infinite life, and if other lands you control can tap to produce at least 3, this combo nets infinite mana.
7. If you get infinite life and infinite mana, you may forego sacrificing the Constructs.

This clever loop turns Urza's Saga and Arwen, Weaver of Hope into a factory for massive life and mana by leveraging the activated ability of Beledros Witherbloom. Because Arwen, Weaver of Hope bestows additional +1/+1 counters upon entry, the Construct token created by Urza's Saga enters large enough to fuel Beledros Witherbloom's life-payment requirement. By sacrificing the creature to Diamond Valley, you regain the spent life and then some, allowing you to untap your lands and repeat the cycle indefinitely. Agatha's Soul Cauldron ties the engine together, seamlessly bridging the abilities so your creatures can execute this miraculous transformation.