First introduced back in Scars of Mirrodin, proliferate was used to multiply not only -1/-1 counters on creatures or loyalty counters on planeswalkers, but also poison counters on players to provide an alternate win condition
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Sacrifice after VI.) I, II, III, IV, V, VI Note a creature type that hasn't been noted for this Saga
And it's colorless so it can fit into any Commander brew with no matter its color identity
So keep that in mind when picking your starting hand
Aboleth Spawn lets you copy an opponents Dockside Extortionist trigger, and because of Active-Player/Non-active-Player ordering, your trigger will then resolve first, so youre free to try and win in someone elses turn