Simic Fluxmage (GTC) from Gatecrash, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Karl Kopinski
• Card Text:
  Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
  1U, T: Move a +1/+1 counter from Simic Fluxmage onto target creature.