Wolfbitten Captive / Krallenhorde Killer

{1}{G}: Wolfbitten Captive gets +2/+2 until end of turn. Activate this ability only once each turn.nnAt the beginning of each upkeep, if no spells were cast last turn, transform Wolfbitten Captive.

{3}{G}: Krallenhorde Killer gets +4/+4 until end of turn. Activate this ability only once each turn.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Krallenhorde Killer.