So Gem-Knight Dia's sword makes no sense

[Bringerofcake]

But now it does

Gem-Knight Malach
EARTH
Rock/Fusion/Effect
6/2300/2200
"Gem-Knight Emerald" + 1 "Gem-Knight" Monster
Must first be Special Summoned by Fusion Summon. If this card attacks a Defense Position monster: destroy it with this card's effect. If this card destroys another monster: Add 1 banished "Gem-Knight" monster to your hand.

[Premier Alexander Romanov]

I don't understand.
What was wrong with Dia's sword?
Going back to the card, the destruction effect seems useful, especially with Zenmaines and Gachi Gachi running around, but what are the odds a Gem-Knight will get Banished?

[Bringerofcake]

1) Dia's sword has all the colors of the rainbow to symbolize each of the GK Fusions, but if you think about it:

Red: Ruby
Orange: Citrine
Yellow: Topaz
Green: ???
Blue: Aquamarine
Indigo: Amethys
Violet: Prism-Aura

There isn't a Gem-Knight Fusion that is "green". This card sees to remedy that.

2) GK Fusion and that one Trap that works like a miracle fusion.