Advanced format ruling
Sinister Seeds
Card effect (current official text)When a monster you control is destroyed by a battle in which you took damage, and it was in face-up Attack Position at the start of the Damage Step and when it was destroyed: Special Summon 1 "Sinister Seed Token" (Plant-Type/DARK/Level 1/ATK 100/DEF 100) for every 500 points of battle damage you took from that battle.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.