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
Dionus, Elvish Archdruid is an uncommon legendary creature from Foundations Jumpstart, one that has a rather unique ability for your next Elf Kindred deck
You dont have to use these spells to eliminate opponents or end the game, either
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The high life totals and inability to safely throw everything at one foe robs these spells of the flexibility that makes them good in the first place
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