There's no minimum quantity required
They can be made better with synergies and the like but mostly they feel much more like a cycling card with a means to mitigate the tempo setback of such things
It has 3 modes: Simplified Display: It only shows the cards and the number of copies you have Detailed Display: It shows general details about the cards, such as its attribute, type, level etc Rarity view: It shows the rarity of the card in the corner The Save button will save the current version of your deck, and give you a warning if it's not legal The 3 lines button open a submenu which reveals 3 buttons The first 2 are for mass Dismantling of cards into CP The third will give you 5 random cards from your deck, mimicking a starting hand The top of the deck builder screen To learn more about what CP is and how to Generate cards, check out our Crafting Guide
shown in the lower-left quadrant of the card, Adventures have their own name, mana cost, type line (including the Adventure subtype), and rules text, while the other part of the card is a permanent
Then, play up to 1 [Zou] from your hand
And heres what it does: At quick effect speed, you can detach a material from this card to negate the activation of a monster effect, and if you do destroy that monster