Dionus, Elvish Archdruid is an uncommon legendary creature from Foundations Jumpstart, one that has a rather unique ability for your next Elf Kindred deck
My guess is that Amulet of Safekeeping is R&Ds attempt to try and answer the question of how to ensure that Modern players can sideboard against multiple strategies at once so that your progression though a large Modern tournament is less matchup dependent
There are some Ravnica Remastered cards that are only available in Collector boosters
Any continuous effects with a "for as long as" duration, such as that of Possession Engine (a card from the Aetherdrift release), ignore phased-out objects
Aethergeode Miner having one toughness and no evasion means it'll most often use the energy it produces to blink, which makes it a useless card

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