Activate Seal of Removal by sacrificing it, returning Lotus-Eye Mystics to your hand.
Cast Lotus-Eye Mystics by paying {4}.
When Lotus-Eye Mystics enters the battlefield, it and Mana Echoes trigger.
Resolve the Lotus-Eye Mystics trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {5}.
Cast Seal of Removal by paying {1}.
Repeat.
If you control six or more Humans and/or Monks, this combo nets infinite mana.

Infinite colored mana

Infinite colorless mana

Infinite ETB

Infinite LTB

Infinite storm count

Mana Echoes

Seal of Removal

Lotus-Eye Mystics

Chromatic Orrery

Mycosynth Lattice

Activate Seal of Removal by sacrificing it, returning Disciple of the Sun to your hand.
Cast Disciple of the Sun by paying {5}.
When Disciple of the Sun enters the battlefield, it and Mana Echoes trigger.
Resolve the Disciple of the Sun trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {6}.
Cast Seal of Removal by paying {1}.
Repeat.
If you control seven or more Humans and/or Clerics, this combo nets infinite mana.

Disciple of the Sun

Activate Seal of Removal by sacrificing it, returning Griffin Dreamfinder to your hand.
Cast Griffin Dreamfinder by paying {5}.
When Griffin Dreamfinder enters the battlefield, it and Mana Echoes trigger.
Resolve the Griffin Dreamfinder trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {6}.
Cast Seal of Removal by paying {1}.
Repeat.
If you control seven or more Griffins, this combo nets infinite mana.

Griffin Dreamfinder

Activate Seal of Removal by sacrificing it, returning Auramancer to your hand.
Cast Auramancer by paying {3}.
When Auramancer enters the battlefield, it and Mana Echoes trigger.
Resolve the Auramancer trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {4}.
Cast Seal of Removal by paying {1}.
Repeat.
If you control five or more Humans and/or Wizards, this combo nets infinite mana.

Auramancer

Activate Seal of Removal by sacrificing it, returning Auramancer to your hand.
Cast Auramancer by paying {3}.
Auramancer enters the battlefield, triggering Auramancer and Mana Echoes.
Resolve the Auramancer trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {5}.
Cast Seal of Removal by paying {1}.
Repeat.

Activate Seal of Removal by sacrificing it, returning Golgari Findbroker to your hand.
Cast Golgari Findbroker by paying {4}.
When Golgari Findbroker enters the battlefield, it and Mana Echoes trigger.
Resolve the Golgari Findbroker trigger, returning Seal of Removal from your graveyard to your hand.
Resolve the Mana Echoes trigger, adding at least {5}.
Cast Seal of Removal by paying {1}.
Repeat.
If you control six or more Elves and/or Shamans, this combo nets infinite mana.

Combos with "Seal of Removal"