First, Magic Arena, practice online and get used to it without much hassle
(if you don't have + you have minstrel) No matter your start, your hand should now have Activate Loading
You can try overwrite the data but the risk you lose your progress is pretty high, since many people crashes while overwriting it 2
ZW - Leo Arms was initially listed under the name "ZW - Dragonic Halberd" on the TV Tokyo website
If a move's type is completely ineffective due to one of the opponent's types, then the move does zero damage, even if the opponent has a second type that would be vulnerable to it (as in Thunderbolt, an Electric-type move, used against a Quagsire, a Water/Ground Pokmon)
Each card has a different Ink Type that will let you know a bit about the main mechanic a deck of that Ink Type will have