If I Had Advice for New Players, It Would Be...
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... to make up your own mind about whether champs are "good" or not. In many cases, a champ gets a bad rep simply because a lot of players don't understand how to use them.
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Comments
do not spend units on cristals
Also, do not chase champs in crystals. Take advantage of the beginner brackets, and grind for 4* champs until your fingers bleed. Then, learn about masteries, and spend all your early units unlocking them.