dawn of the herald
this effect can only activate when herald is summon right ? or the spell card effect can be activate anytime the owner want ?
This card is used to Ritual Summon "Herald of Perfection". You must also Tribute monsters whose total level equals exactly 6 from the field or your hand. When "Herald of Perfection" is Summoned by the effect of this card, you can remove from play this card in your Graveyard to select 1 of the monsters used as a Tribute for the Ritual Summon, and add it from your Graveyard to your hand.
this effect can only activate when herald is summon right ? or the spell card effect can be activate anytime the owner want ?