Your other artifact dorks untap in your end step so they can swing and then untap for blocking or for tapping for effects like mana with Gold Myr
The controller of a Siege cannot be its Protector
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The exiling of the spell with Suspend is what makes this so fun that spell that comes back eventually is gonna trigger Flurry again for you
Rat Colony is easier to cast, they become very potent with cost reducers, and you just get more Rats for your buck
And if you manage to stick it without any threat and back it up with removal/countermagic, then you just start generating too much value