Tengu format ruling
Beast King Barbaros
Card effect (current official text)You can Normal Summon/Set this card without Tributing, but its original ATK becomes 1900. You can Tribute 3 monsters to Tribute Summon (but not Set) this card. If Summoned this way: Destroy all cards your opponent controls.
Rulings
source: Rulings_Tengu (Format Library) · 1 era-inappropriate line(s) removedRulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.