This lets you keep tapping your lands, since they keep untapping each cycle of the combo, meaning infinite mana
"but this also means that the bare minimum cost for staying current enough to be competitive is to buy a $85.99 box of magic cards every four months." Or enter those deck building tournements where all players get randomized cards, and you must put a deck together to play
You can use this to dodge board wipes, attacks, Paddington hard stares and probably your tax bill too
Its pretty easy to construct a deck that flickers this every turn, or even multiple times a turn, to keep key threats tucked away for a while
I know that [[Miirym, Sentinel Wyrm]] has already spiked in price
Both of these cards are pretty powerful for a core set, and (in my opinion) point to a slight change in approach for the R&D team in how they view Core Sets