Even if the cost of the spell or ability that waterbend is part of increases or decreases, you still may only tap artifacts or creatures to pay for costs up to the amount of the generic mana in the waterbend cost
Pair it with the likes of Exploration or Azusa, Lost but Seeking and you have a great draw engine to find whatever it is youre ramping towards
Collectors, in particular, could find great value in the Illustration Rares and alternate card designs
The strategy revolves around using the complete Ojama monster lineup (Yellow, Green, Black, Red, Blue, and Pink) to summon devastating fusion monsters like Ojama King and Ojama Emperor
With a ward trigger of three generic mana, and then forcing them to pay three life as well if they want that spell to go through