The only downside of this card is that its Legendary, meaning you can only have one in play at a time
Determined Iteration pairs well not only with Deadpool and The Master, but also with any other methods for making Deadpool tokens you might have - especially non-legendary clones that won't immediately die
Another thing that makes aggro creatures great is when they come with a little extra, like a strong enters ability or a passive effect that adds value over time, like Voice of Victory, Agent Bishop, Man in Black, Luminarch Aspirant, or Nishoba Brawler
If one thing is true of Magic: The Gathering , it's that the players can be very vocal if they don't like a particular deck or strategy
What a shame about the rest of the card, though
Whenever a land enters the battlefield under your control, you can have target player mill three cards