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[Trade Binder]

Trade Binder

1x {Wingmate Roc} [ktk]

Needed

1x {Wingmate Roc} [ktk]

{Skullbriar, the walking grabe}'s best friend

Thanks, and good luck in games to all!

Recently when opening a booster pack, I found a Hardened Scales. It's an enchantment and a rare, but I am confused on its ability.
It reads:
If one or more +1/+1 counters would be placed on a creature you control, that many plus one +1/+1 counters are to be placed on it instead.

Could someone explain what this means and when to use it?

Thanks