Both of these simplify the game state by removing cards from your opponent, making each +1 from every Gadget summon count that much more
Legendary Creature - Human Soldier Karmic Guide Flying, protection from black Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield
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Then if you cast it from your hand, exile cards from the top of your library until you exile a nonland card
Mew ex makes a massive leap into the triple digits with cards as rough as MP still commanding well over the market price
Authority of the Consuls doesn't trigger off your own creatures, but being an enchantment means it's less vulnerable to removal, and it also comes with the tapdown effect