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Cost reduction has the benefit that it can be played as soon as turn one (if using Kinjalli's Caller) and scales very well when casting multiple Dinosaurs in a turn

C(N K, n k) counts the number of ways to fill the remaining n k slots in the sample with non-successes

Preordain will find you that land or bit of action almost as reliably and that is the majority of what you want card quality for

It also probably makes for a great addition to a lot of different red decks since having it passed around the table with everyone drawing cards off it seems like a really fun card to have in play

As far as playing in tournament scenarios, this means that you can only take cards from your sideboard