Then you have to send cards from the top of your Deck to the grave equal to the number of cards in the opponent's grave
A big part of that comes from Zimone, Mystery Unraveler, who is such a terrifying commander, able to cheat giant creatures onto the board, and facedown, which will always leave your enemies second-guessing
This iconic effect of Obelisk is called Soul Energy MAX
Tauros GX - Secret Rare 156/149 - Sun and Moon 1 Tauros GX - 156/149 SL1 from the Sun and Moon 1 expansion
When used for Ritual Summoning, all the Effect Monsters in this archetype give a buff to the Ritual Monster
If you do not see one of the many later-added set symbols, then you have a base-set, Unlimited card