Balthier and Fran Your vees are pumped in size by +1/+1 and then get reach too and vigilance - nasty combo since you can swing, stay untapped and then block anything, like Serra Angel et all
It also pairs nicely with Warp strategies from Edge of Eternities another reason this set may have sneaky long-term synergy value
Traveling Chocobo even doubles all of Sazhs Chocobos triggers, making sure the creature scales appropriately into the late game
The price you pay for the resulting effects would be very expensive if attached to an instant or sorcery spell, but seeing that they are attached to a creature and can be activated repeatedly and at instant speed, the additional price seems a bit fairer
The most important advantage Sire has over Koma is its mana cost
Putting counters on Black Market is incredibly easy, as one gets put on whenever one of your creatures dies