This efficient card can go wide either to sacrifice lots of Rats to creatures like Redcap Gutter-Dweller, or keep those Rats for once and attack with them
Then you can spend two mana anytime you want, sacrifice an artifact, and do one of three things
On top of that, it reads: At the beginning of your next main phase, add an amount of colourless mana equal to that spells mana value." Basically, not only do you get to say no to something, you also get to cast something bigger on your next turn
For example, if damage is taken when there are two cards in the Damage Zone and zero cards in the players deck, the Damage -- 3 effect will not activate
Sometimes, theyll even Unmask themselves to shoot for the turn 1 Griselbrand
It turns off the legend rule for tokens you control, so equip that Blade to whatever you like