Your search for "tempest technique 56" revealed the following:
Kitsune's Technique - Art Series (Gold-Stamped Signature) (ATMT) from Teenage Mutant Ninja Turtles Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: William Tempest
Tempest Technique (TDC) from Tarkir: Dragonstorm Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Nino Vecia Card Text:Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new...
Tempest Technique - Extended Art (TDC) from Tarkir: Dragonstorm Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Nino Vecia Card Text:StormEnchant creature you controlEnchanted creature gets +1/+1 for each enchantment you control.
Kitsune's Technique - Sewer Frame (TMT) from Teenage Mutant Ninja Turtles, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: William Tempest Card Text:Sneak 1UTarget opponent mills half their library, rounded up.