Activate 1 of these effects (but you can only use each effect of "Gem-Knight Dispersion" once per turn); ● Fusion Summon 1 "Gem-Knight" Fusion Monster from your Extra Deck, using monsters from your hand or field as material. If you have "Gem-Knight Fusion" in your GY, you can also use up to 2 non-Rock "Gem-Knight" monsters from your Deck or Extra Deck. ● Add 1 "Gem-" monster from your Deck or banishment to your hand, also any effect damage your opponent takes during the Main Phase this turn is halved.