yellow digimon cards TCG card BT18-076 Loweemon play deck perfect for both beginners and experienced players Digimon Trading Card Game Next

And honestly maybe Trubbish

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Even a deck building restriction that turns mono-color tokens into multicolor cards would enable this well

Once per turn, during your Standby Phase: You can return 1 Rank 9 or lower Dragon Xyz Monster from your GY to the Extra Deck, then you can Special Summon that monster from your Extra Deck, by using this card you control as material (this is treated as an Xyz Summon, transfer this card's materials).

So, you wont have to worry about running short when preparing your cards