If you control no cards, it can be activated from the hand, making it useful when going second and the card is in your opening hand
Number 107: Galaxy-Eyes Tachyon Dragon X LIGHT Rank 8 [ DragonXyzEffect ] ATK 3000 DEF 2500 2 Level 8 monsters Once per Battle Phase, at the start of your Battle Phase: You can detach 1 material from this card
That's the same size as a card you'd pull from a booster pack, which means your proxies fit standard sleeves, slide into the same deck boxes, and feel identical in hand next to real cards
Example: Player A has the Moon Viewing Yaku (5 points) + Boar-Deer-Butterfly (5 points) + 10 Plain Cards (1 point) = 11 points x 2 = 22 points
This means you either need to include more non-Slivers or accept it will be a small Ooze
The sheer amount of cards that Kregua can draw can refill your entire hand depending on what is on the battlefield before it