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I dont know if its because people are playing less creature-heavy combat decks in general or players are on the lookout for more fills several slots type cards, but prevent all combat damage this turn for a singular mana is still alright in my book

However, each of the XYZ retrains lock the player to only summoning LIGHT monsters from the Extra Deck

DP29-JP020 Y-Dragon (Y)earhead Light Machine / Union / Effect LV4 1500/1600 (1) If this card is Special Summoned: You can equip 1 Level 4 LIGHT Machine monster from your hand or GY to it, also you cannot Special Summon from the Extra Deck for the rest of this turn, except LIGHT monsters

Obviously, rolling a d20, as it usually happens in non-silver-border context, is much stronger than rolling d6 here