Wizards was quick to address the faults of the earliest walkers by two vectors: more generic abilities would make a cheaper or more splashable planeswalker, and more expensive or complex mana costs would grant unique minus abilities and ultimates
Buster Blader, the Destruction Swordmaster X EARTH Level 7 [ WarriorEffect ] ATK 2600 DEF 2300 This card's name becomes "Buster Blader" while on the field or in the GY
The original ruling said that tapping creatures allowed you to reduce the cost of the spell you were casting
Right now, the popular decks dont offer much aggression, so Nami has a better playground
In Commander, however, where fast mana is absolutely everywhere, this card can be played surprisingly early
Rishaden Port can already be a backbreaking card in the right deck, and now Loki turns it into a source of reliable card draw