Eidolon of Obstruction

• WWizards of the Coast2020-01-24
  Official Ruling
  Eidolon of Obstruction doesn’t replace the loyalty cost of activating a loyalty ability or cause it to cost more loyalty to activate. It just adds a mana component to the ability’s activation cost.
• WWizards of the Coast2020-01-24
  Official Ruling
  Loyalty abilities cost just more to activate, no matter how much loyalty they cost to activate.

Rulings via Scryfall