Bluum Erkis, Flare Guardian
Whenever this creature would break one of your opponent's shields, your opponent shows that shield to you instead of putting it into his hand. If it's a spell that has "Shield Trigger" you cast it for no cost, then put it into your opponent's graveyard. If it's not, your opponent puts it into his hand.
Official Wizard's Ruling:-
Q: Bluum Erkis would break a shield, and it's Boomerang Comet. This is a spell that has "shield trigger" that says "Return a card from your mana zone to your hand. After you cast this spell, put it into your mana zone instead of your graveyard." What happens?
A: You cast Boomerang Comet. You return a card from your mana zone to your hand. Then you put Boomerang Comet into your opponent's graveyard because that's what Bluum Erkis tells you to do. Since you were never going to put Boomerang Comet into your graveyard, its effect that says to put it into your mana zone instead of your graveyard doesn't apply.
Pixie Cocoon
[Shield Trigger]
Return a creature from your mana zone to your hand. After you cast this spell, put it into your mana zone.
Pixie Cocoon has no clause which tells me to put it in my mana zone instead of my graveyard. So as far as i know, i get a choice between putting it into my opponent's graveyard (Bluum's ability) and putting it into my mana zone(Pixie Cocoon's ability).
i may be completely wrong but i believe this boils down to this: Who owns the ability of Pixie Cocoon? The card owner or the player casting it. Must i put Pixie into my mana if Bluum broke the shield?






