Overwhelming Stampede (M11) from Magic 2011, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Steven Belledin
• Card Text:
  Creatures you control get +X/+X and gain trample until end of turn, where X is the highest power among creatures you control. (If a creature you control would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.)