For example like Koa'ki Meiru Wall
During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Rock-Type monster in your hand. You can Tribute this card to negate the activation of an opponent's Spell Card and destroy it.
For the 'Tribute' part, is it a cost? So if I use Effect Veiler / Fiendish Chain on it, can it still be able to use it's effect?
Thanks in advance.