Mana Echoes and Eldrazi Displacer on the battlefield.
You control at least three creatures that share a creature type, one of which must be a nontoken creature.
({2} magic symbol) ({C} magic symbol) available.
Steps
Activate Eldrazi Displacer by paying ({2} magic symbol) ({C} magic symbol) , blinking any other nontoken creature that shares a creature type with at least two other creatures you control.
When the creature enters the battlefield, Mana Echoes triggers, adding at least ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Repeat.
If there are four more creatures that share the creature type, this combo nets infinite colorless mana.