Advanced format ruling
Ultimate Offering
Card effect (current official text)During your Main Phase or your opponent's Battle Phase: You can pay 500 Life Points; immediately after this effect resolves, Normal Summon/Set 1 monster.
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.