Like most Magic: The Gathering cards, the value of Altar Ibn-La'Ahad depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Assassin's Creed)
Then, when the time is right, you start casting all of your spells, allowing a bunch of them to get countered
Optimally, those 1/1 rats will have power boosts too, such as from Gnawing Crescendo or Imodane's Recruiter
You won't consider creatures controlled by any other player
(That player looks at the top two cards of their library, then puts one onto the battlefield face down as a 2/2 creature and the other into their graveyard
At least when the pressures on attacking, it fits reds desire for aggro, but as printed it gives the red player near complete control over the combat phase, offensively or defensively