Time Stream — Ruling

Effetto 1

About this card's ① st effect:
This card's effect that Tributes a "Fossil" Fusion Monster and Special Summons another "Fossil" Fusion Monster from your Extra Deck is the effect applied when this card's activation resolves. (It does not target.) [TL note: It targets 1 "Fossil" Fusion Monster you control. This seems to be a typo or copy/paste mistake, since the text and other rulings clearly indicates that it targets.]
Tributing the targeted monster and Special Summoning a "Fossil" Fusion Monster from your Extra Deck happen simultaneously.

About this card's ② nd effect:
This effect is an activated effect, which can be activated in the Graveyard.
This card's effect that Special Summons a "Fossil" Fusion Monster from your Graveyard is an effect that activates in the Graveyard. (It targets 1 "Fossil" Fusion Monster in your Graveyard. It can be activated optionally during your Main Phase. Banishing this card and 1 "Fossil" Fusion Monster from your Graveyard is the cost to activate this effect.)