I know that [[Miirym, Sentinel Wyrm]] has already spiked in price
If an effect causes Purphoros to lose all abilities, its ability that causes it to stop being a creature still applies if appropriate
Theres definitely enough support to play Rev on her own, but Im expecting to see her a lot more as an enabler in decks led by commanders such as Anowon, the Ruin Thief or Prosper Tome-Bound
The way challenging works is a ready (untapped) character exerts and chooses an opposing exerted character to challenge, and then both cards compare their strength (attack) and willpower (defense) values to each other (meaning the attacker automatically gets hit back by the defender)
Sorry it's not hitting the seventh spot...but that would be rough to sell...amiright
That effect naturally creates powerful combos with cards like Ob Nixilis, Unshackled and Opposition Agent, along with anything that punishes opponents for searching their libraries