how to trade cards in yugioh duel links Planned All Along: Yu-Gi-Oh! (Part 1) Trade-In | How to obtain,

It means that the market can change quite quickly

Take Knock Outs, as appropriate, by using Roaring Moon exs Frenzied Gouging attack, which instantly Knocks Out your opponents Pokmon in exchange for Roaring Moon ex doing 200 damage to itself, Roaring Moon exs Calamity Storm, which does 100 damage plus 120 more if you discard a Stadium card in play, or Roaring Moon TEFs Vengeance Fletching, which does 70 damage, plus 10 more damage for each Ancient card in your discard pile

Sliver Gravemother offers something different

This is a worse version of the powerful Imprisoned in the Moon because it's a more easily answered creature and the Commander is a 2/2 creature that can block and die in combat so you may not want to attack on the ground