GX cards I used to have, at least the ones I'm familiar with, the Monarch and Gemini monsters plus extra, the extra cards probably came with this whole set I.E a variant of "Tactical Evolution" pack 1/2/3) Granmarg the Rock Monarch, Raiza the Storm Monarch and Thestalos the Fire Monarch are the three main Monarch monsters I firmly remember having 4/5) Kuraz the Light Monarch and Caius the Shadow Monarch I remember less, mainly Kuraz but if he gives me familiar enough vibes then he's counted in, Caius I remeber a bit more than Kuraz cause he struck me as the coolest one cause darkness monsters were always appealing to me, Cais especially cause he held a dark energy ball in his hands 6) Judgement Dragon- I somewhat recall having this card because this monster looks so regal next to a bright desert behind him, back then I heard this monster was powerful for a reason I forgot, have to check up on it 7/8/9) Dawnbreak Gardna, Goggle Golem and Grasschopper monsters were the Gemini monsters I got with Monarch monsters thought I don't remember them quite well

But how did you know that
In some decks, that might even be easier to achieve
The basic premise is as follows: you battle duelists and, by employing Spell, Trap, and Monster cards, you win battles and DP (Duel Points) which you can then use to buy more cards
Thanks to this, getting around Magics mana system with free spells and cards that cheat in others can be incredibly powerful
Any Magic: The Gathering investor knows how valuable sets like Modern Horizons are in the long run