Although there is currently no average market price, TCGPlayer lists Ariel's Iconic card at a price of $1,349.97 USD , as of the time of writing
If Dionus leaves the battlefield and returns to the battlefield in the same turn, or if one Dionus leaves and another Dionus enters, the ability granted by the old one is different from the ability granted by the new one
Note that this does not make them immune to the movement of damage counters, but it still protects them from snipers like Greninja
In fact, it might be the uptick of interest in Living End caused by Lorwyn Eclipsed that caused WotC to consider this unban
Transforming cards to introduce werewolves into the game is peak design in my opinion
So long as youre able to net at least one extra mana for playing and bouncing Palinchron a ton of times, you end up with all the mana in the world