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The crucial factor, here, is that Gem-Knight is shockingly good against exactly Droll & Lock Bird, which is seeing Main Deck play at the moment

Pick your weapon, and if you can, pick up your Horse [/spoiler] [Spoiler Different Dimension Border Master] Straight to the point

A two-color deck typically works best for beginners exploring multiple play styles

Plus, if you do the activated ability, that exiled card remains available turn after turn until you activate it again

destroy them, and if you destroyed a face-up Fiend monster(s) by this effect, this card gains ATK equal to half the Fiend monster(s)'s original ATK, until the end of this turn

Decks that focus on spells and traps can be hard to play against