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For right now, Amulet of Safekeeping seems unlikely to show up in Standard, mostly because Goblin Chainwhirler has already pushed token decks out of the format, but there are a ton of powerful token strategies available, including Saprolings and Anointed Procession, so things could certainly change in the future in a way that makes Amulet of Safekeeping into a sideboard staple

If this card is sent to your Graveyard from your side of the field, you may add 1 Level 11 monster from your Deck to your hand

Well, it still looks pretty similar to how the desktop does

But what are these cards, and how do they work

Generally, Wizards of the Coast knows what they are doing when they face Commander in a precon, and all of these are powerful enough to win you the game with Energy

Jaden and Yusei have dialogue with characters outside of their own series because they canonically interact with each other in Yu-Gi-Oh!: Bonds Beyond Time