Setessan Tactics (JOU) from Journey into Nyx, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Mark Winters
• Card Text:
  Strive — Setessan Tactics costs G more to cast for each target beyond the first.
  Until end of turn, any number of target creatures each get +1/+1 and gain "T: This creature fights another target creature."