The Halfling is a one-drop rare with the ability to tap for colorless or for mana of any color but just for legendaries that cannot be countered
A common starting point is around 10 ramp sources and 8 to 12 draw or card advantage sources, then adjust for your commander and game plan
You can play them as-is, of course, but you can also take them apart and add in new cards, take out ones you dont like and just generally experiment with them
say, why not take control of it
A first turn Academy of a Crop Rotation would make sure that your opponent couldn't play his or hers and combo off as easily
Dark Dhampir Vampire Sheridan 2+ Level 6 monsters If you use a monster(s), with a Level, that is owned by your opponent for the Xyz Summon of this card, treat it as Level 6