Sure, there are ways to ramp in other colors or with colorless cards, but none seem to offer anything quite on greens level
Activate "Sanct" to Special Summon 1 "Fiendsmith Token"
UR Ultra Rare The Sacred Waters in the Sky X SPELL Activate 1 "The Sanctuary in the Sky" directly from your Deck, or add 1 monster that mentions "The Sanctuary in the Sky" from your Deck to your hand, then, if "The Sanctuary in the Sky" is on the field or in either GY, you can gain 500 LP for each "Hyperion" and "The Agent" monster you control
Shock and Awe: In the anime, Dark Rebellion's draining effect has it snaring the opponent with electric tendrils, and they often become shrouded in lightning when attacking
(They put the top card of their library into their graveyard.).Sacrifice Merfolk Windrobber: Draw a card
While this card isnt a great pick for every Water deck, it excels in situations where you have more than enough Monsters in your hand and want to exchange them for Spell or Trap cards