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{3}{G}: Krallenhorde Killer gets +4/+4 until end of turn. Activate only once each turn.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform Krallenhorde Killer.
For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).
If you activate one face’s ability, and some effect causes the card to transform twice that turn, you won’t be able to activate that face’s ability again that turn.
You can activate Wolfbitten Captive’s ability, let it transform into Krallenhorde Killer, then activate Krallenhorde Killer’s ability, all on the same turn, and vice versa.
