Declare Fear of Missing Out as an attacker, triggering its ability, causing you to untap it and to get an additional combat phase after this one.
Deal combat damage to an opponent using Fear of Missing Out, triggering Impostor Syndrome, creating a token copy of Fear of Missing Out that isn't legendary.
When the Fear of Missing Out token enters, it triggers, causing you to rummage
During your next combat phase, declare Fear of Missing Out and the Fear of Missing Out token as attackers.
The Fear of Missing Out token triggers, causing you to untap the nontoken Fear of Missing Out and to get an additional combat phase after this one.
Repeat from step 2.
This loop turns a single attacker into an ever-multiplying army of extra combat steps, powered entirely by Fear of Missing Out and Impostor Syndrome. Each time your original or token attacker connects, Impostor Syndrome steps in to clone it, instantly triggering Fear of Missing Out's entry effect to churn through your hand with rummaging while continuously granting extra combat phases. Meanwhile, Dragonlord Kolaghan lurks in the background, anchoring the strategy by ensuring your entire explosive team can charge straight into battle with haste the moment they hit the board.