If the target creature is an illegal target as Sin's last ability tries to resolve, it won't resolve and none of its effects will happen
Get your land count somewhere between your pip percentage and non-land percentage
Early plays ramp up the pressure, while late-game pulls give the last little push
You might be interested in a pumped up version of this card, Grand Crescendo, though that spell makes Citizens instead of Warriors
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
Mastering the graveyard can yield some incredibly potent effects, so long as you play your cards right