If you cast draw 3 like Harmonize, you will discard one, then draw, discard one, then draw, and discard one, then draw, resulting in you not generating card advantage
It can take away all backrow, Monsters, or a Graveyard from the opponent, all with minimal costs
This is first seen in Episode II, when he absorbs the energy from Ashiyan's Agony Beam and the light released from Ecclesia's stigmata to transform into Brigrand the Glory Dragon, and again in Episode VI, when he absorbs the immense amount of Hole energy released by Golgonda to become Albion the Branded Dragon
Then you may cast that spell without paying its mana cost
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Playmat : While not required, a playmat provides a clean, smooth surface to play on, protecting your sleeved cards from dirt and grime on the table