Talk:Ultimate Buddy!/@comment-28801394-20160624225300/@comment-24612605-20160625133235

Yes, if they don't have counter you can only cast them during main phase.

(Key word cast, using the ability of a spell like for example the set spell Gate of darkness dragon doesn't have a counter but it triggers during the opponent's turn but this only because it's a set spell)

Normal spells:  Only your main phase

Counter spells: Any phase unless otherwise specified on the card

Set Spells: Can only be set on your main phase, abilities trigger when a condition is required, or in the case of cards that boost cards like this piece of trash because I am too lazy to think of another example,  have a continues effect on the field

This is a normal spell so can only be casted during main phase, then it applies it's effect which is a continues effect within the soul