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If the cunning opponent controls Trinisphere, and you cast a spell by paying Flashback cost, you will have to pay the Spheres tax if the mana part of the total cost of the spell nets for less than three

However, that "no limit" number may vary or depend upon the strength of outside signal because stronger the signal outside, larger the coverage area inside, and higher the number of devices that will be encompassed in that coverage range area

Lets take a slightly weird but easy one as a closing example

Cards like Rashmi and Ragavan, Urza, Lord High Artificer, and Inspiring Statuary that care about a critical mass of artifacts love this card