At the time, it was seeing play in Modern (mostly out of the sideboard) in B/W Tokens and Soul Sisters builds
You probably don't want to use that nasty chemical on this nice battle though, especially since it'll erase the field all on its own
You have access to a couple of -1/-1 counter cards between Yawgmoth, Black Sun's Zenith, and others, so be aware that +1/+1 and -1/-1 counters nullify each other
The pirate Captain Lannery Storm creates a Treasure token when it attacks, making it the ideal creature to pair with Isshin, getting two Treasures from each attack
Since there are tons of different sets that can be combined, you should be able to respond to different broken plays from different sets if you want to win
As you activate Ninjutsu, you can Impulse three cards down instead of four then draw one