This allows you to attempt to discard energy cards from your opponents active Pokemon, at the point that Gyarados evolves from Magikarp
The only reasons it isn't higher are because it requires a costly six mana each turn to pull off, eating into resources you could be spending winning, and because needing two colours in your colour identity limits the decks it could fit into
Updated January 23, 2022 by Johnny Garcia : After months of waiting, Yu-Gi-Oh
If you cascade into a counterspell, you can cast that spell the same as you would any other cascaded spell
And it works on any form of leaving the battlefield, so you can bounce or exile or even shuffle it into your library, so it works with effects as diverse as Terminus, Fleetfoot Panther, and effects like Goblin Bombardment and Crystal Shard