mtg cards with jump start Direct Current | card lists inside any given pack Jump-start Mechanic in MTG: Rules,

The recursion is just icing on the cake, especially if we can squeeze some Implements or a couple of Servo Exhibitions in the deck

If a targeted permanent is untapped at the time its controller's next untap step begins, this ability has no effect on it

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Locus of the Roil is probably the best for a typal Elemental deck, having an ETB and a Landfall trigger that relates to Elementals

44Conclave + Arcana Cards

If you include proliferate abilities in this deck, and youve been consistently dropping counters on your opponents creatures, you could tap them en masse and launch a big attack of your own without worrying that theyll attack you back