Hi, I was playing today against a Macro deck when my opponent activated Macro cosmos. After that I activated:
Send, FROM YOUR DECK TO THE GRAVEYARD, Fusion Material Monsters that are listed on a Fusion Monster Card, and select that 1 Fusion Monster from your Fusion Deck. Special Summon a Fusion Monster from your Fusion Deck with the same name as the selected Fusion Monster during your 2nd Standby Phase after this card's activation. (This Special Summon is treated as a Fusion Summon.) When this card is removed from the field, destroy the monster. When the monster is destroyed, destroy this card.
He told me I can't do this because I must send to the graveyard, not to RFG, monster's that are listed on a Fusion Monster Card but I can't send monsters to the graveyard by Macro cosmos effect.
I think I'm right but I want to be sure.