The extra part of generating mana of any color gets better if you have changelings, aliens, or doctors
This allows certain card effects that require both Toon World and an accompanying monster on the field to go live
No, and that's on purpose
I imagine some scribe drawing these in a dark, rarely used library corner
"Players will be able to open two booster packs every day at no cost, including cards with nostalgic illustrations, as well as new cards only found in the app
Gathering "Buildragon", "Drake Crush", and/or "Pylon" in the Graveyard to Special Summon back will usually take several turns, so they are vulnerable to cards that can shuffle them from the Graveyard into the Deck before they can be used