A fleet of Thopters ends the game quickly, especially when you consider impulse draw is just card advantage, so you get a lot from a mere 2-mana play
It is similar to Evolving Wilds, but it puts basic lands on the battlefield untapped, which changes everything
Second, from there, youre free to sacrifice Ranger-Captain of Eos to prevent your opponent from countering Walking Ballista or messing with your combo in any other way
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This is useful in a huge variety of situations, and while its not repeatable like others on the list, it is cheaper than some of the other choices