What's the most coin-efficient way to condense pluses onto 1 powerful card?

What's the most coin-efficient way to condense pluses onto 1 powerful card? - Bird's Eye View Of Roadway Surrounded By Trees

Generally you get pluses one at a time, usually on cards you would just sell. Pluses are usually all fed to single powerful card to make it better.

The problem is that that's expensive. Feeding a single junky card to an high-level ultimate evo card can cost over 50k coins. What's the most coin-efficient way of moving pluses from a ton of crummy cards to a single powerful card?

Should I feed all the pluses to a junky card for cheap, them feed that one card to the target once it's +297?






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