You choose how many targets Armament Dragon's triggered ability has and how the counters are distributed as you put the ability onto the stack
A few enablers like Errant, Street Artist and Lier, Disciple of the Drowned, and youve got something
(Exile cards from the top of your library until you exile a nonland card with mana value 5 or less
Being able to tutor anything you want into your graveyard for a single mana makes it pretty easy to reanimate something like Atraxa, Griselbrand, or Archon of Cruelty on Turn 1, which is incredibly hard to beat
For just three mana you can set Hypergenesis aside for three turns with suspend counters on it, building up an optimal hand for when it resolves
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