Aaron, Mutant Hellspawn

Haste, Trample, Deathtouch
You gain life rather than lose life from radiation.
Whenever a player loses life from radiation,for each 1 life lost, Aaron deals X damage to that player, where X is Aaron's power, you gain life equal to the life lost this way.
Whenever Aaron is transformed, each player gets X rad counters, where X is the number of rad counters among all players + 1 for each card in each graveyard.
When Aaron attacks, he gets +X/+X until end of turn, where X is the number of rad counters