Its a planeswalker with an immediate impact on the board, even if its attacked down the very next turn
At a base cost of one green and one blue mana, the number of counters depends on how many extra generic mana the player wishes to pay
Weftwalking Weftwalking is a chunky cost at and the ability to shuffle all your stuff into your library before you draw seven is definitely good
Yes, building with eight or nine MDFCs will increase the number of lands you have that will come into play tapped, but it shouldn't increase it enough to be problematic, especially compared to the consistency and power you gain from the spell-land hybrids
Add in some big life spenders like Doom Whisperer and Reanimate, however, and you can grab everything up to heaters like Avacyn, Angel of Hope
Look at each creature as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times