When Atarkas not killing players with commander damage, its usually doing a good job of giving your other dragons double strike, which means it even has an impact on combat the turn it comes into play
Its even more restrictive than something like Infect, which at least interacts well with mechanics such as Proliferate
Well cover both shells below
But right now, its the most valuable printing of Relentless Rats around, with more unique printings likely coming in the future
Just attacking with this for 5 is like a big burn spell, it works well with Undying Evil, and even if you lose this, the renew ability distributing decayed counters paves the way for big attacks
If Storm of Saruman was the first spell you cast this turn, the next spell you cast this turn is your second spell