No because the field spell card is just simply being replacing by another field spell. So, you can't use Magical Citadel of Endymion's effect to stop it from being sent to the graveyard. However, you may protect your field spell card with the spell card Field Barrier.
Yes, Magical Citadel of Endymion can remove its own counters to pay the cost of another card's activation. So you can remove three from the Citadel. There is no need for Royal Magical Library to have any counters at the time. Magical Citadel of Endymion pays the cost instead.
BastionCastle
The fortress can also be called a citadel. Hope this helps :)
yep, some writers use citadel to make it sound a little more dramatic
A non-magical being, with magical parents.
AH.... another word for DESTRUCTION is.......distroyed...............
bastion, bulwark, citadel, fortification, fortress, parapet, stronghold
fort fortress bulwark citadel strongghold chateau turret palace
Base, building, bunker, another b word, shelter, home, citadel, so on so forth
Destruction.
destroy destruction
Destruction