Your search for "Assault Formation 246" revealed the following:
Assault Formation (Foil) (DTK) from Dragons of Tarkir, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Kieran Yanner Card Text:Each creature you control assigns comabt damage equal to its toughness rather than its power.G: Target creature with defender...
Assault Formation (TDC) from Tarkir: Dragonstorm Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Kieran Yanner Card Text:Each creature you control assigns combat damage equal to its toughness rather than its power.G: Target creature with defender can...