Only one loyalty ability of each planeswalker may be activated per turn, no matter how many it has gained
The restriction on keeping Reclusive Wight is so stifling, theres no realistic way to both keep it alive and have any sort of gameplan that involves attacking or blocking
Elementals can get pretty pricey, so 5 mana is often a cost reduction, and at instant speed, you can pull a lot of surprises outside your turn
Eventually the board is filled with a whole bunch of tasty things: Beasts and Dinosaurs of all sizes, Plant tokens the size of giant redwood trees, a Chandra and a Lord Windgrace ready to go off, plus a Sphinx of Foresight for good measure
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The only optional part of the ability is whether or not you cast the last card exiled