You should aim to have several [Trafalgar Law] cards with a cost of 4 or more in your hand to make use of your Leader effect, which reduces the cost when playing [Trafalgar Law] cards with a cost of 4 or more
You get +2/+2 immediately on an evasive body and then you get another +2/+2 later down the line
To be able to play Magic Online you don't have to make any monthly payment , you will only have to spend money on buying new cards
If you're playing Cleric or Soldier Commander, it might be worth considering the proper charm, but there otherwise isn't much to see here
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Designs like Sarkhan, Soul Aflame and Sarkhan, Fireblood are effectively ramp for your dragons