Beastmaster's Magemark (GPT) from Guildpact, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Brandon Kitkouski
• Card Text:
  Enchant creature
  Creatures you control that are enchanted get +1/+1.
  Whenever a creature you control that's enchanted becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.