To celebrate that milestone, it's released a free native iOS app available via the App Store today
or you can do away with Sanctuary altogether, and make one of those 'this card is treated at Umi on the field'-type clones.
but were afraid to ask
Got some Duel Terminal cards without the Duel Terminal foil, got the Stone Soldier with the Upper Deck icons, got some miscuts, crimped cards, etc
This ultimately failed, as Celina was still able to destroy both of his monsters and damage him significantly in her next turn
While some hyper efficient, single-target interaction like countermagic and Path to Exile is useful, you should also invest in cards like Grasp of Fate, Soul Shatter, and Convert to Slime to keep ahead on cards while putting your opponents behind on the board