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.
This ingenious loop transforms a modest monk into a versatile engine by fundamentally rewriting the battlefield's very nature with Mycosynth Lattice. Because the Lattice turns all permanents into artifacts, Seal of Removal can target *any* permanent—allowing the newly recast Lotus-Eye Mystics to routinely pluck it right back out of the graveyard upon entry. Meanwhile, Mana Echoes watches these endless arrivals and generously pays you back with a surplus of colorless mana, which is easily filtered into any color thanks to Mycosynth Lattice's flexible mana-spending rules.