yugioh level reducing cards Up! - Soul of the Duelist Star Changer | Yu-Gi-Oh! Wiki

Both of these cards work exceptionally well with Karumonix, because when his enter the battlefield ability triggers, youre likely to draw multiple copies of them and each copy makes your board substantially better

Rather than relying on creature combat, this deck was based around the "engine" created by these two cards

Make sure you have a good amount of Basic Pokmon so you can get them into play quickly, then have a smaller number of Pokmon at Stage 1 that evolve from the Basic Pokmon you have, and an even smaller selection of Stage 2 Pokmon

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These combine to form a 40-card deck, and you keep the cards (about 22 non-basics) as a reward