As there were seven regions for the tournament, it can be assumed that there were at least seven produced
It turns out that a 6/7 reach solves a lot of issues in green and generally trumps everything else in the cube you expect people to cast barring Dragonlord Atarka (which is typically in the deck along with the Chancellor!)
The value here is that it untaps on other players untap phases, giving you many more chances to activate abilities
She's a four drop that untaps a land on her +1 so that makes her really a 3-drop
Full Steam Ahead As our gameplan revolves around getting Thassa out as early as possible, we want to compliment our gameplan with the fastest mana rocks available
Play Other Cards for Free and Cost Reducers Two more related categories that are not included here are cards that play other cards for free, cheat things into play, and cost reducers, some of which can combine to make cards free, but that's not the focus here