Slimefoot's Survey

The trick here is that one action feeds itself: fetch first, then measure. You pull up to two basic-typed lands onto the battlefield tapped, which can widen the spread of basic land types you control, and only after those lands have arrived does the spell count them to size the dig. Perform the fixing, and the fixing you just performed determines how deep you look. That collapses two effects a greedy manabase usually wants (color correction and card selection) into a single cast, so a diverse base compounds instead of demanding a follow-up spell to cash in. The design answers a real weakness of rainbow piles: they flood and stall worse than tight manabases, and the standard fix (jamming in more fixing) just swaps one dead draw for another. This does the fixing and the smoothing at once, then declines to promise the payoff. You keep at most one card on top and scatter the rest to the bottom in random order, so the dig only arranges your very next draw; nothing gets stacked deeper. At five mana and sorcery speed it behaves as a midgame stabilizer, not an early accelerant. The reward for assembling a varied base pipes straight into the reward for wielding it, which makes the greed pay for itself within a single resolution.