What does color mastery do?

What does color mastery do? - High angle of wet dirty roller for painting on plastic cap from paint on floor

In MTG: Puzzle Quest, after playing for a while with a card in your deck you earn "Mastery" over that card. The app tells you this, with a +2 (that is, a symbol of colored mana matching the color of the card). What effect does this have over the card, the deck or your planeswalker?

magic-the-gathering-puzzle-quest

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What does color mastery do? - From above of clean roller for repair on plastic tank for paint at home

What does color mastery do? - Paint in plastic container on floor

What does color mastery do? - Water Dew on Grasses

( MAX MASTERY DRAGON ) DRAGON FRUIT COLOR SHOWCASE IN BLOX FRUITS - PART 39

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Images: Ksenia Chernaya, Ksenia Chernaya, Ksenia Chernaya, Pixabay