It's basically the same thing Dark Patch LOR 216 does for dark Pokmon and Metal Saucer SSH 170 does for metallic Pokmon, except Aqua Patch GRI 119 is suited for the Water archetype
S:3 Ep:45 Duration: 21:12 The Final Face-Off, Part 5 Yu-Gi-Oh
As long as this Pokmon is in the Active Spot, your opponent cant play any Pokmon that has an Ability from their hand, except for Team Rockets Pokmon
A card that is only good in specific, rare situations isnt as strong as one that helps you every single game
This is the same for all other keyword counters, such as flying and trample
A board wipe can therefore stop sliver decks in their tracks, and put you in a really painful position, struggling to rebuild from scratch with a now depleted hand