Spells and traps are almost exclusively obtained through wins in this mod. Megamorph: Dropped by Labyrinth Mage (A-TEC) at a 20% rate.
The strongest monsters often require specific rank strategies. Yugioh Forbidden Memories Mod 15 Drop List
Highest chance from Seto 1 or Kaiba (SA-TEC/POW). Spells and traps are almost exclusively obtained through