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While the Rings trigger is on the stack waiting to resolve, you may target it with Resonator

Effect: Once per turn, you can tribute any number of "Eldritch" monsters, then special summon one "Eldritch Overlord" Ritual monster from your hand with a level equal or lower than the combined levels of the tributed monsters

The main reason this card is so great is that you can reuse it every turn

If you bring a creature to the battlefield during the opponent's turn (for example, Teferi Mage of Zhalfir), and the cunning opponent phase it out, Teferi will phase in at the beginning of your untap step, and you can attack with it during the same turn