Magic is complex as hell, and rearranging its phases creates ambiguity of a different nature
Lagorin, Soul of Alacria for example has a Saddle cost of one meaning a creature with a power of one or greater must be used to Saddle it
Firstly, as a counter to enemy board-wipes, where it can essentially close a game by wasting a control players best answer along with their turn
I suspect Polluted Cistern alone would already see play in EDH
Ive played enough Vampire decks to know how good this effect is, and if you can copy it, even better
Red/green: Power Matters Aggro It does seem like Wizards deliberately tried to keep most color pairs within their very safe, traditional mechanical territory with Tales of Middle-earth perhaps acknowledging this set might draw in less experienced Magic players