Antagonist's Daisho

Equip {4}
Equipped creature has +1/+1 and has first strike
and deathtouch. If Antagonist's Daisho is
equipped to Antagonist, instead Antagonist gains "Whenever Antagonist deals combat damage to a player, you win the game."
"Honestly, how could it NOT be mine. It's a sword
with a long knife to stab them in the back while they
block the sword!"