Gem-Knight Prism Aura vs Macro Cosmo / Dimensional Fissure

<blockquote>Prism Aura:
1 "Gem-Knight" Monster + 1 Thunder-Type Monster
This monster can only be Special Summoned by Fusion Summon (from the Extra Deck). Once per turn, you can send 1 "Gem-Knight" card from your hand to the Graveyard to select 1 face-up card on the field, and destroy it.

Polymerization:
Send Fusion Material Monsters that are listed on a Fusion Monster Card from your hand or your side of the field to the Graveyard, and Special Summon that Fusion Monster from your Extra Deck.

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Can it activated ?
Should be work.... because its send not discard... just like polys
but I am not too sure about this....

Doesn't work because the sending is a cost. Poly works because there is no cost, it's all part of the effect.

A cost must always be paid exactly as stated.

Prism Aura cannot be activated while Macro Cosmos, Dimensional Fissure, because you can't pay the cost which is send a Gem-Knight Monster to grave. However, if you activate Prism Aura then your opponent activates Macro, effect still apply because you already pay the cost.

In comparaison with Polymerisation, since it is typed send monsters to grave AND Special summon a Fusion Monster, sending fusion material monsters to graveyard is a part of effect, so you can use polymerisation and send monsters to banished zone (if D fissure or Macro Cosmos is in grave) to fusion summon your monster.

Prism Aura:
The CARD'S TEXT said:

"Gem-Knight" Monster + 1 Thunder-Type Monster
Once per turn, you can send 1 "Gem-Knight" card from your hand to the Graveyard to select 1 face-up card on the field, and destroy it

It is a cost due to the bold text in that card's text written

Polymerization:
Send Fusion Material Monsters that are listed on a Fusion Monster Card from your hand or your side of the field to the Graveyard, and Special Summon that Fusion Monster from your Extra Deck

Send a fusion material to grave is a part o effect due to the bold text in that card's text

P.S: netdecking isn't good for duelist except u're hitsuGAYa toushiro. Own deck that not consistent deck better than netdeck. 'cos netdeck = not using ur own deck to duel