Cloaked Cadet (DBL) from Innistrad: Double Feature, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Igor Kieryluk
• Card Text:
  Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
  Whenever one or more +1/+1 counters are put on one or more Humans you control, draw a card. This ability triggers only once each turn.