They never have a cost to use, and the effect cannot be stopped unless the artifact is removed from play or tapped by a spell effect
Bare in mind, that these are NOT official yet, they may be fake, but they do look pretty legit from what I can tell
The answer is still a resounding yes
Warrior Spell cards Painful Choice Ante Fensheng Mirror Ground Collapse The Graveyard in the Fourth Dimension Combination Attack Pot of Acquisitiveness Recycle Inferno Tempest Painful Return Inferno Reckless Summon Lightning Vortex Chaos End Level Up
GOTCHA, THAT WAS A FUN GAME
That might not sound like a big deal, but its as much as 900 ATK for an entire turn, and there are no restrictions on the rest of your field, no demand for a specific monster Type, and no reduction to your battle damage