Breeches, Brazen Plunderer (Borderless) [The Lost Caverns of Ixalan Special Guests]

Menace
Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents' libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells.
Partner (You can have two commanders if both have partner.)