Tengu format ruling
Black Garden
Card effect (current official text)If a monster(s) is Normal or Special Summoned face-up, except by the effect of "Black Garden": Halve its ATK, then, the controller of that monster Special Summons 1 "Rose Token" (Plant/DARK/Level 2/ATK 800/DEF 800) to their opponent's field in Attack Position. (This ATK loss remains even if this card leaves the field.) You can target 1 monster in your GY with ATK equal to the total ATK of all Plant monsters on the field; destroy this card and as many Plant monsters on the field as possible, then, if you destroyed all of them, Special Summon that targeted monster.
Rulings
- A token is summoned even if the monster's ATK can't be halved, as long as that monster is still on the field when this effect resolves (even if it's face-down or was summoned face-down).
- The ATK loss remains even if this card's effect becomes negated or if it leaves the field.
- If "Shrink" is later used on the monster whose ATK was halved: Its ATK becomes half its original ATK, and in the End Phase, its ATK becomes its original (printed) ATK.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.